cs 79 - Page 80 - Developer IT

Setting Session Variable from UpdatePanel

- by Gavin

I am using ASP.NET 2.0 AJAX Extensions 1.0 with the version v1.0.20229 of the AJAX Control Toolkit (which to my knowledge is the latest for .NET 2.0/Visual Studio 2005). My web page (aspx) has a DropDownList control on an UpdatePanel. In the handler for the DropDownList's SelectedIndexChanged event I attempt to set a session variable. The first time the event is fired, I get a Sys.WebForms.PageRequestManagerParserErrorException: "The message received from the server could not be parsed". If I continue, subsequent SelectedIndexChanged's are handled successfully. I have stumbled upon a solution whereby if I initialise the session variable in my Page_Load (so the event handler is just setting the value of a session variable that already exists as opposed to creating a new one) the problem goes away. I'm happy to do this, but I'm curious as to exactly what the underlying cause is. Can anyone explain? (My suspicion is that setting the session variable receives a response from the server which is then returned to the 'caller', but it's not the sort of response it knows how to deal with causing the exception?) EDIT: I reproduced the problem in a seperate little project: Default.aspx <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="SessionTest._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" /> <div> <asp:UpdatePanel id="upCategorySelector" runat="server"> <ContentTemplate> Category: <asp:DropDownList ID="ddlCategory" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlCategories_SelectedIndexChanged"> <asp:ListItem>Item 1</asp:ListItem> <asp:ListItem>Item 2</asp:ListItem> <asp:ListItem>Item 3</asp:ListItem> </asp:DropDownList> </ContentTemplate> </asp:UpdatePanel> </div> </form> </body> </html> Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; namespace SessionTest { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { // If I do this, the exception does not occur. if (Session["key"] == null) Session.Add("key", 0); } protected void ddlCategories_SelectedIndexChanged(object sender, EventArgs e) { // If Session["key"] has not been created, setting it from // the async call causes the excaption Session.Add("key", ((DropDownList)sender).SelectedValue); } } }

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Deploying an HttpHandler web service

- by baron

I am trying to build a webservice that manipulates http requests POST and GET. Here is a sample: public class CodebookHttpHandler: IHttpHandler { public void ProcessRequest(HttpContext context) { if (context.Request.HttpMethod == "POST") { //DoHttpPostLogic(); } else if (context.Request.HttpMethod == "GET") { //DoHttpGetLogic(); } } ... public void DoHttpPostLogic() { ... } public void DoHttpGetLogic() { ... } I need to deploy this but I am struggling how to start. Most online references show making a website, but really, all I want to do is respond when an HttpPost is sent. I don't know what to put in the website, just want that code to run. Edit: I am following this site as its exactly what I'm trying to do. I have the website set up, I have the code for the handler in a .cs file, i have edited the web.config to add the handler for the file extension I need. Now I am at the step 3 where you tell IIS about this extension and map it to ASP.NET. Also I am using IIS 7 so interface is slightly different than the screenshots. This is the problem I have: 1) Go to website 2) Go to handler mappings 3) Go Add Script Map 4) request path - put the extension I want to handle 5) Executable- it seems i am told to set aspnet_isapi.dll here. Maybe this is incorrect? 6) Give name 7) Hit OK button: Add Script Map Do you want to allow this ISAPI extension? Click "Yes" to add the extension with an "Allowed" entry to the ISAPI and CGI Restrictions list or to update an existing extension entry to "Allowed" in the ISAPI and CGI Restrictions list. Yes No Cancel 8) Hit Yes Add Script Map The specified module required by this handler is not in the modules list. If you are adding a script map handler mapping, the IsapiModule or the CgiModule must be in the modules list. OK edit 2: Have just figured out that that managed handler had something to do with handlers witten in managed code, script map was to help configuring an executable and module mapping to work with http Modules. So I should be using option 1 - Add Managed Handler. See: http://yfrog.com/11managedhandlerp I know what my request path is for the file extension... and I know name (can call it whatever I like), so it must be the Type field I am struggling with. In the applications folder (in IIS) so far I just have the MyHandler.cs and web.config (Of course also a file with the extension I am trying to create the handler for!) edit3: progress So now I have the code and the web.config set up I test to see If I can browse to the filename.CustomExtension file: HTTP Error 404.3 - Not Found The page you are requesting cannot be served because of the extension configuration. If the page is a script, add a handler. If the file should be downloaded, add a MIME map. So in IIS7 I go to Handler Mappings and add it in. See this MSDN example, it is exactly what I am trying to follow The class looks like this: using System.Web; namespace HandlerAttempt2 { public class MyHandler : IHttpHandler { public MyHandler() { //TODO: Add constructor logic here } public void ProcessRequest(HttpContext context) { var objResponse = context.Response; objResponse.Write("<html><body><h1>It just worked"); objResponse.Write("</body></html>"); } public bool IsReusable { get { return true; } } } } I add the Handler in as follows: Request path: *.whatever Type: MyHandler (class name - this appears correct as per example!) Name: whatever Try to browse to the custom file again (this is in app pool as Integrated): HTTP Error 500.21 - Internal Server Error Handler "whatever" has a bad module "ManagedPipelineHandler" in its module list Try to browse to the custom file again (this is in app pool as CLASSIC): HTTP Error 404.17 - Not Found The requested content appears to be script and will not be served by the static file handler.

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Why does IHttpAsyncHandler leak memory under load?

- by Anton

I have noticed that the .NET IHttpAsyncHandler (and the IHttpHandler, to a lesser degree) leak memory when subjected to concurrent web requests. In my tests, the development web server (Cassini) jumps from 6MB memory to over 100MB, and once the test is finished, none of it is reclaimed. The problem can be reproduced easily. Create a new solution (LeakyHandler) with two projects: An ASP.NET web application (LeakyHandler.WebApp) A Console application (LeakyHandler.ConsoleApp) In LeakyHandler.WebApp: Create a class called TestHandler that implements IHttpAsyncHandler. In the request processing, do a brief Sleep and end the response. Add the HTTP handler to Web.config as test.ashx. In LeakyHandler.ConsoleApp: Generate a large number of HttpWebRequests to test.ashx and execute them asynchronously. As the number of HttpWebRequests (sampleSize) is increased, the memory leak is made more and more apparent. LeakyHandler.WebApp TestHandler.cs namespace LeakyHandler.WebApp { public class TestHandler : IHttpAsyncHandler { #region IHttpAsyncHandler Members private ProcessRequestDelegate Delegate { get; set; } public delegate void ProcessRequestDelegate(HttpContext context); public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object extraData) { Delegate = ProcessRequest; return Delegate.BeginInvoke(context, cb, extraData); } public void EndProcessRequest(IAsyncResult result) { Delegate.EndInvoke(result); } #endregion #region IHttpHandler Members public bool IsReusable { get { return true; } } public void ProcessRequest(HttpContext context) { Thread.Sleep(10); context.Response.End(); } #endregion } } LeakyHandler.WebApp Web.config <?xml version="1.0"?> <configuration> <system.web> <compilation debug="false" /> <httpHandlers> <add verb="POST" path="test.ashx" type="LeakyHandler.WebApp.TestHandler" /> </httpHandlers> </system.web> </configuration> LeakyHandler.ConsoleApp Program.cs namespace LeakyHandler.ConsoleApp { class Program { private static int sampleSize = 10000; private static int startedCount = 0; private static int completedCount = 0; static void Main(string[] args) { Console.WriteLine("Press any key to start."); Console.ReadKey(); string url = "http://localhost:3000/test.ashx"; for (int i = 0; i < sampleSize; i++) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); request.Method = "POST"; request.BeginGetResponse(GetResponseCallback, request); Console.WriteLine("S: " + Interlocked.Increment(ref startedCount)); } Console.ReadKey(); } static void GetResponseCallback(IAsyncResult result) { HttpWebRequest request = (HttpWebRequest)result.AsyncState; HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(result); try { using (Stream stream = response.GetResponseStream()) { using (StreamReader streamReader = new StreamReader(stream)) { streamReader.ReadToEnd(); System.Console.WriteLine("C: " + Interlocked.Increment(ref completedCount)); } } response.Close(); } catch (Exception ex) { System.Console.WriteLine("Error processing response: " + ex.Message); } } } }

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Problem with initializing a type with WinsdorContainer

- by the_drow

public ApplicationView(string[] args) { InitializeComponent(); string configFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "log4net.config"); FileInfo configFileInfo = new FileInfo(configFilePath); XmlConfigurator.ConfigureAndWatch(configFileInfo); IConfigurationSource configSource = ConfigurationManager.GetSection("ActiveRecord") as IConfigurationSource; Assembly assembly = Assembly.Load("Danel.Nursing.Model"); ActiveRecordStarter.Initialize(assembly, configSource); WindsorContainer windsorContainer = ApplicationUtils.GetWindsorContainer(); windsorContainer.Kernel.AddComponentInstance<ApplicationView>(this); windsorContainer.Kernel.AddComponent(typeof(ApplicationController).Name, typeof(ApplicationController)); controller = windsorContainer.Resolve<ApplicationController>(); // exception is thrown here OnApplicationLoad(args); } The stack trace is this: Castle.MicroKernel.ComponentActivator.ComponentActivatorException was unhandled Message="ComponentActivator: could not instantiate Danel.Nursing.Scheduling.Actions.DataServices.NurseAbsenceDataService" Source="Castle.MicroKernel" StackTrace: at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateInstance(CreationContext context, Object[] arguments, Type[] signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveServiceDependency(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.Resolve(CreationContext context, ISubDependencyResolver parentResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateConstructorArguments(ConstructorCandidate constructor, CreationContext context, Type[]& signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveServiceDependency(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.Resolve(CreationContext context, ISubDependencyResolver parentResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateConstructorArguments(ConstructorCandidate constructor, CreationContext context, Type[]& signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.ResolveServiceDependency(CreationContext context, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.Resolvers.DefaultDependencyResolver.Resolve(CreationContext context, ISubDependencyResolver parentResolver, ComponentModel model, DependencyModel dependency) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateConstructorArguments(ConstructorCandidate constructor, CreationContext context, Type[]& signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.Instantiate(CreationContext context) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.InternalCreate(CreationContext context) at Castle.MicroKernel.ComponentActivator.AbstractComponentActivator.Create(CreationContext context) at Castle.MicroKernel.Lifestyle.AbstractLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Lifestyle.SingletonLifestyleManager.Resolve(CreationContext context) at Castle.MicroKernel.Handlers.DefaultHandler.Resolve(CreationContext context) at Castle.MicroKernel.DefaultKernel.ResolveComponent(IHandler handler, Type service, IDictionary additionalArguments) at Castle.MicroKernel.DefaultKernel.ResolveComponent(IHandler handler, Type service) at Castle.MicroKernel.DefaultKernel.get_Item(Type service) at Castle.Windsor.WindsorContainer.Resolve(Type service) at Castle.Windsor.WindsorContainer.ResolveT at Danel.Nursing.Scheduling.ApplicationView..ctor(String[] args) in E:\Agile\Scheduling\Danel.Nursing.Scheduling\ApplicationView.cs:line 65 at Danel.Nursing.Scheduling.Program.Main(String[] args) in E:\Agile\Scheduling\Danel.Nursing.Scheduling\Program.cs:line 24 at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: System.ArgumentNullException Message="Value cannot be null.\r\nParameter name: types" Source="mscorlib" ParamName="types" StackTrace: at System.Type.GetConstructor(BindingFlags bindingAttr, Binder binder, Type[] types, ParameterModifier[] modifiers) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.FastCreateInstance(Type implType, Object[] arguments, Type[] signature) at Castle.MicroKernel.ComponentActivator.DefaultComponentActivator.CreateInstance(CreationContext context, Object[] arguments, Type[] signature) InnerException: It actually says that the type that I'm trying to initialize does not exist, I think. This is the concreate type that it complains about: namespace Danel.Nursing.Scheduling.Actions.DataServices { using System; using Helpers; using Rhino.Commons; using Danel.Nursing.Model; using NHibernate.Expressions; using System.Collections.Generic; using DateUtil = Danel.Nursing.Scheduling.Actions.Helpers.DateUtil; using Danel.Nursing.Scheduling.Actions.DataServices.Interfaces; public class NurseAbsenceDataService : AbstractDataService<NurseAbsence>, INurseAbsenceDataService { NurseAbsenceDataService(IRepository<NurseAbsence> repository) : base(repository) { } //... } } The AbstractDataService only holds the IRepository for now. Anyone got an idea why the exception is thrown?

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Code that Worked with MultiView fails with Wizard ASP.NET

- by davemackey

I originally created a process that occurred by transitioning between views in a multiview and it worked fine. Now, I've moved this same code into a ASP.NET Wizard and it keeps throwing an error at the second step. The error is: Method 'System.Object AndObject(System.Object, System.Object)' has no supported translation to SQL. Any ideas why this would occur when moving the code into the wizard? I'm sure its something stupid, but I've checked over the code 3-4 times now and it appears identical operationally. Here is the code: ' Make sure we have the LDAP portion of the .NET Framework available. Imports System.DirectoryServices ' Allows us to interface with LDAP. Imports System.Data.Linq.SqlClient ' Allows us to use LINQ SQL Methods. Partial Public Class buildit Inherits System.Web.UI.Page Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load ' ******* Grab the LDAP info. for current user. Dim ID As FormsIdentity = DirectCast(User.Identity, FormsIdentity) Dim ticket As FormsAuthenticationTicket = ID.Ticket Dim adDirectory As New DirectoryEntry("LDAP://OU=[info],DC=[info],DC=[info],DC=[info]") ' We need to strip off @email.address from the ticket name, so we'll use substring to grab the first ' five characters. Dim adTicketID As String = ticket.Name.Substring(0, 5) Dim adEmployeeID As String adEmployeeID = adDirectory.Children.Find("CN=" & adTicketID).Properties("employeeID").Value ' ******* Lets make sure they have signed the housing contract and the community covenant. Dim dbContractSigs As New pcRoomOccupantsDataContext Dim pcContractSigs = From p In dbContractSigs.webContractSigs _ Where p.people_id = adEmployeeID _ Select p.res_contract, p.comm_life If pcContractSigs.Count.Equals(0) Then Response.Redirect("signcontract.aspx") Else Dim cs As String = pcContractSigs.First.res_contract.ToString Dim cos As String = pcContractSigs.First.comm_life.ToString If cs = "Y" And cos = "Y" Then ' We don't need to do anything. ' We use the else statement b/c there are multiple conditions that could occur besides "N" ' that would cause us to redirect to the signature page, whereas there is only one valid response - "Y". Else ' Redirect the individual to our contracts page. Response.Redirect("signcontract.aspx") End If End If ' ******* Now lets find out what gender that individual is. Dim dbIndividual As New pcPeopleDataContext Dim pcIndividual = From p In dbIndividual.PEOPLEs _ Join d In dbIndividual.DEMOGRAPHICs On p.PEOPLE_CODE_ID Equals d.PEOPLE_CODE_ID _ Where p.PEOPLE_ID = adEmployeeID _ Select p, d ' Make a session variable that will carry with the user throughout the session delineating gender. Session("sgender") = pcIndividual.First.d.GENDER.ToString ' Debug Code. ' Put a stop at end sub to get these values. ' Response.Write(adEmployeeID) End Sub Sub LinqDataSource1_Selecting(ByVal sender As Object, ByVal e As LinqDataSourceSelectEventArgs) ' Lets get a list of the dorms that are available for user's gender. Dim pcDorms As New pcDormsDataContext Dim selectedDorms = (From sd In pcDorms.PBU_WEB_DORMs _ Where IIf(Session("sgender").ToString = "M", sd.description = "Male", sd.description = "Female") _ Select sd.dorm_building).Distinct() e.Result = selectedDorms End Sub Public Sub Button_ItemCommand(ByVal Sender As Object, ByVal e As RepeaterCommandEventArgs) ' ******** Lets pass on the results of our query in LinqDataSource1_Selecting. Session("sdorm") = RTrim(e.CommandName) ' ******** Debug code. ' Response.Write(sDorm) End Sub Sub LinqDataSource2_Selecting(ByVal sender As Object, ByVal e As LinqDataSourceSelectEventArgs) ' ******** Get a list of rooms available in the dorm for user's gender. Dim pcDorms As New pcDormsDataContext Dim selectedDorm = (From sd In pcDorms.PBU_WEB_DORMs _ Where IIf(Session("sgender").ToString = "M", sd.description = "Male", sd.description = "Female") _ And sd.dorm_building = CStr(Session("sdorm")) _ Select sd.dorm_room) e.Result = selectedDorm End Sub Public Sub Button2_ItemCommand(ByVal Sender As Object, ByVal e As RepeaterCommandEventArgs) ' ******** Lets pass on the results of our query in LinqDataSource2_Selecting. Session("sroom") = RTrim(e.CommandName) End Sub Sub LinqDataSource3_Selecting(ByVal sender As Object, ByVal e As LinqDataSourceSelectEventArgs) ' ******** Grabs the individuals currently listed as residing in this room and displays them. Note the use of SqlMethods.Like ' for dorm_building, this is due to legacy issues where dorms sometimes have leading or trailing blank spaces. We could have ' also used Trim. Dim pcOccupants As New pcRoomOccupantsDataContext Dim roomOccupants = (From ro In pcOccupants.webResidents _ Where SqlMethods.Like(ro.dorm_building, "%" & CStr(Session("sdorm")) & "%") _ And ro.dorm_room = CStr(Session("sroom")) _ Select ro.person_name) e.Result = roomOccupants ' ******** Debug code. 'Response.Write(CStr(Session("sdorm"))) 'Response.Write(CStr(Session("sroom"))) End Sub Protected Sub Button4_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button4.Click ' ******** Reserve the room for a student. End Sub End Class

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"The Controls collection cannot be modified because the control contains code blocks"

- by Daniel P

I am trying to create a simple user control that is a slider. When I add a AjaxToolkit SliderExtender to the user control I get this (*&$#()@# error: Server Error in '/' Application. The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %). Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %). Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [HttpException (0x80004005): The Controls collection cannot be modified because the control contains code blocks (i.e. <% ... %).] System.Web.UI.ControlCollection.Add(Control child) +8677431 AjaxControlToolkit.ScriptObjectBuilder.RegisterCssReferences(Control control) in d:\E\AjaxTk-AjaxControlToolkit\Release\AjaxControlToolkit\ExtenderBase\ScriptObjectBuilder.cs:293 AjaxControlToolkit.ExtenderControlBase.OnLoad(EventArgs e) in d:\E\AjaxTk-AjaxControlToolkit\Release\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:306 System.Web.UI.Control.LoadRecursive() +50 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627 Version Information: Microsoft .NET Framework Version:2.0.50727.3074; ASP.NET Version:2.0.50727.3074 I have tried putting a placeholder in the user control and adding the textbox and slider extender to the placeholder programmatically and I still get the error. Here is the simple code: <table cellpadding="0" cellspacing="0" style="width:100%"> <tbody> <tr> <td></td> <td> <asp:Label ID="lblMaxValue" runat="server" Text="Maximum" CssClass="float_right" /> <asp:Label ID="lblMinValue" runat="server" Text="Minimum" /> </td> </tr> <tr> <td style="width:60%;"> <asp:CheckBox ID="chkOn" runat="server" /><asp:Label ID="lblPrefix" runat="server" />: <asp:Label ID="lblSliderValue" runat="server" /> <asp:Label ID="lblSuffix" runat="server" /> </td> <td style="text-align:right;width:40%;"> <asp:TextBox ID="txtSlider" runat="server" Text="50" style="display:none;" /> <ajaxToolkit:SliderExtender ID="seSlider" runat="server" BehaviorID="seSlider" TargetControlID="txtSlider" BoundControlID="lblSliderValue" Orientation="Horizontal" EnableHandleAnimation="true" Length="200" Minimum="0" Maximum="100" Steps="1" /> </td> </tr> </tbody> What is the problem? Thanks in advance. Dan

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ASP.NET Send Image Attachment With Email Without Saving To Filesystem

- by KGO

I'm trying to create a form that will send an email with an attached image and am running into some problems. The form I am creating is rather large so I have created a small test form for the purpose of this question. The email will send and the attachment will exist on the email, but the image is corrupt or something as it is not viewable. Also.. I do not want to save the image to the filesystem. You may think it is convoluted to take the image file from the fileupload to a stream, but this is due to the fact that the real form I am working on will allow multiple files to be added through a single fileupload and will be saved in session, thus the images will not be coming from the fileupload control directly on submit. File: TestAttachSend.aspx <%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestAttachSend.aspx.cs" Inherits="TestAttachSend" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <h1>Send Email with Image Attachment</h1> Email Address TO: <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox><br /> Attach JPEG Image: <asp:FileUpload ID="fuImage" runat="server" /><br /> <br /> <asp:Button ID="btnSend" runat="server" Text="Send" onclick="btnSend_Click" /><br /> <br /> <asp:label ID="lblSent" runat="server" text="Image Sent!" Visible="false" EnableViewState="false"></asp:label> </div> </form> </body> </html> File: TestAttachSend.aspx.cs using System; using System.Collections.Generic; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Net.Mail; using System.IO; public partial class TestAttachSend : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void btnSend_Click(object sender, EventArgs e) { if (fuImage.HasFile && fuImage.PostedFile.ContentType == System.Net.Mime.MediaTypeNames.Image.Jpeg) { SmtpClient emailClient = new SmtpClient(); MailMessage EmailMsg = new MailMessage(); EmailMsg.To.Add(txtEmail.Text.Trim()); EmailMsg.From = new MailAddress(txtEmail.Text.Trim()); EmailMsg.Subject = "Attached Image"; EmailMsg.Body = "Image is attached!"; MemoryStream imgStream = new MemoryStream(); System.Drawing.Image img = System.Drawing.Image.FromStream(fuImage.PostedFile.InputStream); string filename = fuImage.PostedFile.FileName; img.Save(imgStream, System.Drawing.Imaging.ImageFormat.Jpeg); EmailMsg..Attachments.Add(new Attachment(imgStream, filename, System.Net.Mime.MediaTypeNames.Image.Jpeg)); emailClient.Send(EmailMsg); lblSent.Visible = true; } } }

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How to use multiple instances of a usercontrol (with jquery) on the same page

- by Julian

Hi All, I've been working on an usercontrol with a jquery timer in it. At first I had the jquery within the usercontrol. But when I add 2 of those controls to my page the second usercontrol isn't showing it's data very well. Now I've put the jquery into the mainpage and the usercontrol only uses the id's of the jquery. Here is my usercontrol: <%@ Control Language="C#" AutoEventWireup="true" CodeFile="WebUserControl.ascx.cs" Inherits="WebUserControl" %> <style type="text/css"> #mainpanel { width: 145px; height: 123px; } </style> <div id="mainpanel"> <div> test</div> <div id="shortly" style="background-color: #FFFFFF"> </div> <button id="resetButton"> Reset </button> </div> Mainpage: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <%@ Register Src="WebUserControl.ascx" TagName="WebUserControl" TagPrefix="uc1" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>hoi</title> <script src="Scripts/jquery-1.4.2.min.js" type="text/javascript"></script> <script src="Scripts/jquery-ui-1.8.1.custom.min.js" type="text/javascript"></script> <link href="Css/jquery-ui-1.8.1.custom.css" rel="stylesheet" type="text/css" /> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script> <script type="text/javascript" src="Scripts/jquery.countdown.js"></script> <script type="text/javascript"> $(document).ready(function () { $(function() { $("#mainpanel"); }); shortly = new Date(); shortly.setSeconds(shortly.getSeconds() + 5.5); $('#shortly').countdown({ until: shortly, onExpiry: liftOff, layout: '{sn}', }); $('#resetButton').click(function () { $('#mainpanel').effect("highlight", {}, 700 ); $('#shortly').effect("highlight", {}, 700 ); shortly = new Date(); shortly.setSeconds(shortly.getSeconds() + 5.5); $('#shortly').countdown('change', { until: shortly }); }); function liftOff() { // refresh the page window.location = window.location; } }); </script> </head> <body> <uc1:WebUserControl ID="WebUserControl1" runat="server" /> </body> </html> But still my usercontrols are acting weird, now my question is: "How can I make the SAME usercontrols work properly on ONE page?" Both of those use the same jquery code but the buttons etc. should only work within the usercontrol itself.

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CSS not working in ASP.NET

- by Tux

Hi, I have created a simple page in HTML which works fine. But when I import that to ASP.NET, the page design clutters up. Here is my Site.Master <%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site.master.cs" Inherits="Elite.WUI.Site" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title></title> <link rel="stylesheet" type="text/css" href="styles.css" /> </head> <body> <form id="form1" runat="server"> <asp:ContentPlaceHolder ID="headerCPH" runat="server"> <div id="header"> <h1>WUI</h1> </div> <hr /> </asp:ContentPlaceHolder> <asp:ContentPlaceHolder ID="navigationCPH" runat="server"> <div id="navigation"> <ul> <li>Home</li> <li>Users</li> <li>Campaigns</li> <li>Settings</li> </ul> </div> </asp:ContentPlaceHolder> <asp:ContentPlaceHolder ID="contentCPH" runat="server"> </asp:ContentPlaceHolder> </form> </body> </html> my stylesheet styles.css #navigation { float: left; border: 1pt solid; } #navigation ul { list-style-type: none; padding: 5 5 5 5; margin: 0; } #content { margin-left: 9%; border: 1pt solid; padding-left: 5; } and the actual page derived from master page <%@ Page Title="" Language="C#" MasterPageFile="~/Site.Master" AutoEventWireup="true" CodeBehind="ABC.aspx.cs" Inherits="Elite.WUI.ABC" %> <asp:Content ID="Content3" ContentPlaceHolderID="contentCPH" runat="server"> <div id="content"> <p>Test content</p> </div> </asp:Content> Here is how it is displayed in Firefox (ver 3.6) As you can see that the border, list-style-type properties are working but margin isn't working. Can anyone tell me what am I doing wrong? I have tested it in Google Chrome but same issue. While the HTML and CSS works fine when there is no ASP.NET i.e. simple .html file.

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ObjectContext.SaveChanges() fails with SQL CE

- by David Veeneman

I am creating a model-first Entity Framework 4 app that uses SQL CE as its data store. All is well until I call ObjectContext.SaveChanges() to save changes to the entities in the model. At that point, SaveChanges() throws a System.Data.UpdateException, with an inner exception message that reads as follows: Server-generated keys and server-generated values are not supported by SQL Server Compact. I am completely puzzled by this message. Any idea what is going on and how to fix it? Thanks. Here is the Exception dump: System.Data.UpdateException was unhandled Message=An error occurred while updating the entries. See the inner exception for details. Source=System.Data.Entity StackTrace: at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) at System.Data.EntityClient.EntityAdapter.Update(IEntityStateManager entityCache) at System.Data.Objects.ObjectContext.SaveChanges(SaveOptions options) at System.Data.Objects.ObjectContext.SaveChanges() at FsDocumentationBuilder.ViewModel.Commands.SaveFileCommand.Execute(Object parameter) in D:\Users\dcveeneman\Documents\Visual Studio 2010\Projects\FsDocumentationBuilder\FsDocumentationBuilder\ViewModel\Commands\SaveFileCommand.cs:line 68 at MS.Internal.Commands.CommandHelpers.CriticalExecuteCommandSource(ICommandSource commandSource, Boolean userInitiated) at System.Windows.Controls.Primitives.ButtonBase.OnClick() at System.Windows.Controls.Button.OnClick() at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e) at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e) at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent) at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e) at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args) at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted) at System.Windows.Input.InputManager.ProcessStagingArea() at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input) at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport) at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel) at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.Run() at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at FsDocumentationBuilder.App.Main() in D:\Users\dcveeneman\Documents\Visual Studio 2010\Projects\FsDocumentationBuilder\FsDocumentationBuilder\obj\x86\Debug\App.g.cs:line 50 at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: System.Data.EntityCommandCompilationException Message=An error occurred while preparing the command definition. See the inner exception for details. Source=System.Data.Entity StackTrace: at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree) at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.CreateCommand(UpdateTranslator translator, Dictionary`2 identifierValues) at System.Data.Mapping.Update.Internal.DynamicUpdateCommand.Execute(UpdateTranslator translator, EntityConnection connection, Dictionary`2 identifierValues, List`1 generatedValues) at System.Data.Mapping.Update.Internal.UpdateTranslator.Update(IEntityStateManager stateManager, IEntityAdapter adapter) InnerException: System.NotSupportedException Message=Server-generated keys and server-generated values are not supported by SQL Server Compact. Source=System.Data.SqlServerCe.Entity StackTrace: at System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateReturningSql(StringBuilder commandText, DbModificationCommandTree tree, ExpressionTranslator translator, DbExpression returning) at System.Data.SqlServerCe.SqlGen.DmlSqlGenerator.GenerateInsertSql(DbInsertCommandTree tree, List`1& parameters, Boolean isLocalProvider) at System.Data.SqlServerCe.SqlGen.SqlGenerator.GenerateSql(DbCommandTree tree, List`1& parameters, CommandType& commandType, Boolean isLocalProvider) at System.Data.SqlServerCe.SqlCeProviderServices.CreateCommand(DbProviderManifest providerManifest, DbCommandTree commandTree) at System.Data.SqlServerCe.SqlCeProviderServices.CreateDbCommandDefinition(DbProviderManifest providerManifest, DbCommandTree commandTree) at System.Data.Common.DbProviderServices.CreateCommandDefinition(DbCommandTree commandTree) at System.Data.Common.DbProviderServices.CreateCommand(DbCommandTree commandTree) at System.Data.Mapping.Update.Internal.UpdateTranslator.CreateCommand(DbModificationCommandTree commandTree) InnerException:

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How to give ASP.NET access to a private key in a certificate in the certificate store?

- by thames

I have an ASP.NET application that accesses private key in a certificate in the certificates store. On Windows Server 2003 I was able to use winhttpcertcfg.exe to give private key access to the NETWORK SERVICE account. How do I give permissions to access a Private Key in a certificate in the certificate store (Local Computer\Personal) on a Windows Server 2008 R2 in an IIS 7.5 website? I've tried giving Full Trust access to "Everyone", "IIS AppPool\DefaultAppPool", "IIS_IUSRS", and everyother security account I could find using the Certificates MMC (Server 2008 R2). However the below code demonstrates that the code does not have access to the Private Key of a certificate that was imported with the private key. The code instead throws and error everytime the private key property is accessed. Default.aspx <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <%@ Import Namespace="System.Security.Cryptography.X509Certificates" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:Repeater ID="repeater1" runat="server"> <HeaderTemplate> <table> <tr> <td> Cert </td> <td> Public Key </td> <td> Private Key </td> </tr> </HeaderTemplate> <ItemTemplate> <tr> <td> <%#((X509Certificate2)Container.DataItem).GetNameInfo(X509NameType.SimpleName, false) %> </td> <td> <%#((X509Certificate2)Container.DataItem).HasPublicKeyAccess() %> </td> <td> <%#((X509Certificate2)Container.DataItem).HasPrivateKeyAccess() %> </td> </tr> </ItemTemplate> <FooterTemplate> </table></FooterTemplate> </asp:Repeater> </div> </form> </body> </html> Default.aspx.cs using System; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; using System.Web.UI; public partial class _Default : Page { public X509Certificate2Collection Certificates; protected void Page_Load(object sender, EventArgs e) { // Local Computer\Personal var store = new X509Store(StoreLocation.LocalMachine); // create and open store for read-only access store.Open(OpenFlags.ReadOnly); Certificates = store.Certificates; repeater1.DataSource = Certificates; repeater1.DataBind(); } } public static class Extensions { public static string HasPublicKeyAccess(this X509Certificate2 cert) { try { AsymmetricAlgorithm algorithm = cert.PublicKey.Key; } catch (Exception ex) { return "No"; } return "Yes"; } public static string HasPrivateKeyAccess(this X509Certificate2 cert) { try { string algorithm = cert.PrivateKey.KeyExchangeAlgorithm; } catch (Exception ex) { return "No"; } return "Yes"; } }

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update datagridview using ajax in my asp.net without refreshing the page.(Display real time data)

- by kurt_jackson19

I need to display a real time data from MS SQL 2005. I saw some blogs that recommend Ajax to solve my problem. Basically, right now I have my default.aspx page only just for a workaround I could able to display the data from my DB. But once I add data manually to my DB there's no updating made. Any suggestions guys to fix this problem? I need to update datagridview with out refreshing the page. Here's my code on Default.aspx.cs using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Data.SqlClient; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { FillDataGridView(); } protected void up1_Load(object sender, EventArgs e) { FillDataGridView(); } protected void FillDataGridView() { DataSet objDs = new DataSet(); SqlConnection myConnection = new SqlConnection (ConfigurationManager.ConnectionStrings["MainConnStr"].ConnectionString); SqlDataAdapter myCommand; string select = "SELECT * FROM Categories"; myCommand = new SqlDataAdapter(select, myConnection); myCommand.SelectCommand.CommandType = CommandType.Text; myConnection.Open(); myCommand.Fill(objDs); GridView1.DataSource = objDs; GridView1.DataBind(); } } Code on my Default.aspx <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Ajax Sample</title> </head> <body> <form id="form1" runat="server"> <asp:ScriptManager ID="ScriptManager1" runat="server" EnablePageMethods="true"> <Scripts> <asp:ScriptReference Path="JScript.js" /> </Scripts> </asp:ScriptManager> <asp:UpdatePanel ID="UpdatePanel1" runat="server" OnLoad="up1_Load"> <ContentTemplate> <asp:GridView ID="GridView1" runat="server" Height="136px" Width="325px"/> </ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="GridView1" /> </Triggers> </asp:UpdatePanel> </form> </body> </html> My problem now is how to call or use the ajax.js and how to write a code to call the FillDataGridView() in my Default.aspx.cs page. Thank you guys, hope anyone can help me on this problem.

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Applying a Dojo Toolkit (Dijit) theme to ASP.NET pages.

- by mcoolbeth

In the code below, I am trying to apply a Dijit theme to the controls in my .aspx page. However, the controls persist in their normal, unthemed appearance. Anybody know why? Master Page: <%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Main.master.cs" Inherits="WebJournalEntryClient.Main" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>My Web Application</title> <link rel="stylesheet" href="dojoroot/dijit/themes/tundra/tundra.css" /> <script type="text/javascript" src="dojoroot/dojo/dojo.js"/> <script type="text/javascript"> dojo.require("dijit.form.Button"); dojo.require("dijit.form.TextBox"); dojo.require("dijit.form.ComboBox"); </script> </head> <body class = "tundra"> <form id="form1" runat="server"> <div> <div> This is potentially space for a header bar. </div> <table> <tr> <td> Maybe <br /> a <br /> Side <br /> bar. </td> <td> <asp:ContentPlaceHolder ID="CenterPlaceHolder" runat="server"/> </td> </tr> </table> <div> This is potentially space for a footer bar. </div> </div> </form> </body> </html> Content Page: <%@ Page Title="" Language="C#" MasterPageFile="~/Main.Master" AutoEventWireup="true" CodeBehind="LogIn.aspx.cs" Inherits="WebJournalEntryClient.LogIn" %> <asp:Content ID="Content" ContentPlaceHolderID="CenterPlaceHolder" runat="server"> <div> User ID: <asp:TextBox ID = "UserName" dojoType="dijit.form.TextBox" runat="server" /><br /> Password: <asp:TextBox ID = "PassWord" dojoType="dijit.form.TextBox" runat="server" /><br /> <asp:Button ID="LogInButton" Text="Log In" dojoType="dijit.form.Button" runat="server" /> </div> </asp:Content>

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Illegal cross thread operation exception, unable to handle it

- by yeah1000

Hello, i am using visual C# express 2008. I SOMETIMES get the illegal cross thread operation in my invoke method when i try to run my project. It use the same invoke method in many places but its only at the beginning of another thread that i get the error. I check the InvokeRequired property, invoke the same method and in the 'else' condition and create a temporary variable and assign it the text of my control. But on that line, in the 'else' statement, inside the Invoking method i sometimes get the exception. What could be the cause? How to get rid of it? It does not occur often, but it is still a bug... Code: // Delegate: private delegate void ChangeTextDelegate(string text); // Method: public static void ChangeText(string text) { if (richtextbox1.InvokeRequired) { richtextbox1.Invoke(new ChangeTextDelegate(ChangeText), new object[] { text }); } else { int startIndex; startIndex = richtextbox1.TextLength; // <- Exception points here. // ... } } Stack trace: System.InvalidOperationException was unhandled Message="Cross-thread operation not valid: Control 'SomeClass' accessed from a thread other than the thread it was created on." Source="System.Windows.Forms" StackTrace: at System.Windows.Forms.Control.get_Handle() at System.Windows.Forms.Control.get_InternalHandle() at System.Windows.Forms.Control.WmWindowPosChanged(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.TextBoxBase.WndProc(Message& m) at System.Windows.Forms.RichTextBox.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam) at System.Windows.Forms.NativeWindow.DefWndProc(Message& m) at System.Windows.Forms.Control.DefWndProc(Message& m) at System.Windows.Forms.Control.WmCreate(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.TextBoxBase.WndProc(Message& m) at System.Windows.Forms.RichTextBox.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.IntCreateWindowEx(Int32 dwExStyle, String lpszClassName, String lpszWindowName, Int32 style, Int32 x, Int32 y, Int32 width, Int32 height, HandleRef hWndParent, HandleRef hMenu, HandleRef hInst, Object pvParam) at System.Windows.Forms.UnsafeNativeMethods.CreateWindowEx(Int32 dwExStyle, String lpszClassName, String lpszWindowName, Int32 style, Int32 x, Int32 y, Int32 width, Int32 height, HandleRef hWndParent, HandleRef hMenu, HandleRef hInst, Object pvParam) at System.Windows.Forms.NativeWindow.CreateHandle(CreateParams cp) at System.Windows.Forms.Control.CreateHandle() at System.Windows.Forms.TextBoxBase.CreateHandle() at System.Windows.Forms.Control.get_Handle() at System.Windows.Forms.RichTextBox.get_TextLength() at SomeNamespace.SomeClass.Changetext(String text, Color color) in C:\...\SomeClass.cs:line 827 at SomeNamespace.SomeClass.SomeThreadFun() in C:\...\SomeClass.cs:line 112 at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: TY

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Changing color of HighlighBrushKey in XAML

- by phil

Hi, I have the following problem. The background color in a ListView is set LightGreen or White, whether a boolflag is true or false. Example Screen Window1.xaml: <Window.Resources> <Style TargetType="{x:Type ListViewItem}"> <Style.Triggers> <DataTrigger Binding="{Binding Path=BoolFlag}" Value="True"> <Setter Property="Background" Value="LightGreen" /> </DataTrigger> </Style.Triggers> </Style> </Window.Resources> <StackPanel> <ListView ItemsSource="{Binding Path=Personen}" SelectionMode="Single" SelectionChanged="ListViewSelectionChanged"> <ListView.View> <GridView> <GridViewColumn DisplayMemberBinding="{Binding Path=Vorname}" Header="Vorname" /> <GridViewColumn DisplayMemberBinding="{Binding Path=Nachname}" Header="Nachname" /> <GridViewColumn DisplayMemberBinding="{Binding Path=Alter}" Header="Alter" /> <GridViewColumn DisplayMemberBinding="{Binding Path=BoolFlag}" Header="BoolFlag" /> </GridView> </ListView.View> </ListView> </StackPanel> Window1.xaml.cs: public partial class Window1 : Window { private IList<Person> _personen = new List<Person>(); public Window1() { _personen.Add(new Person { Vorname = "Max", Nachname = "Mustermann", Alter = 18, BoolFlag = false, }); _personen.Add(new Person { Vorname = "Karl", Nachname = "Mayer", Alter = 27, BoolFlag = true, }); _personen.Add(new Person { Vorname = "Josef", Nachname = "Huber", Alter = 38, BoolFlag = false, }); DataContext = this; InitializeComponent(); } public IList<Person> Personen { get { return _personen; } } private void ListViewSelectionChanged(object sender, SelectionChangedEventArgs e) { Person person = e.AddedItems[0] as Person; if (person != null) { if (person.BoolFlag) { this.Resources[SystemColors.HighlightBrushKey] = Brushes.Green; } else { this.Resources[SystemColors.HighlightBrushKey] = Brushes.RoyalBlue; } } } } Person.cs: public class Person { public string Vorname { get; set; } public string Nachname { get; set; } public int Alter { get; set; } public bool BoolFlag { get; set; } } Now I want to set the highlight color of the selected item, depending on the boolflag. In Code-Behind I do this with: private void ListViewSelectionChanged(object sender, SelectionChangedEventArgs e) { Person person = e.AddedItems[0] as Person; if (person != null) { if (person.BoolFlag) { this.Resources[SystemColors.HighlightBrushKey] = Brushes.Green; } else { this.Resources[SystemColors.HighlightBrushKey] = Brushes.RoyalBlue; } } } } This works fine, but now I want to define the code above in the XAML-file. With <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Green" /> I can overwrite the default-value. However, it works, but the color is set to Green for all selected items. I have tried different ways to switch the color of HighlightBrushKey between Green and Blue in XAML, depending on the boolflag, but I didn't succeed. May you can help me and give me some examples?

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There is an error in XML document... When calling to web service

- by Sigurjón Guðbergsson

I have created a web service and a function in it that should return a list of 11thousand records retreived from a pervasive database Here is my function in the web service. [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] [System.ComponentModel.ToolboxItem(false)] public class BBI : System.Web.Services.WebService { [WebMethod] public List<myObject> getAll() { List<myObject> result = new List<myObject>(); PsqlConnection conn = new PsqlConnection("Host=soemthing;Port=something;Database=something;Encoding=IBM861"); conn.Open(); string strSql = "select 0, 1, 2, 3, 4, 5 from something"; PsqlCommand DBCmd = new PsqlCommand(strSql, conn); PsqlDataReader myDataReader; myDataReader = DBCmd.ExecuteReader(); while (myDataReader.Read()) { myObject b = new myObject(); b.0 = Convert.ToInt32(myDataReader[0].ToString()); b.1 = myDataReader[1].ToString(); b.2 = myDataReader[2].ToString(); b.3 = myDataReader[3].ToString(); b.4 = myDataReader[4].ToString(); b.5 = myDataReader[5].ToString(); result.Add(b); } conn.Close(); myDataReader.Close(); return result; } } Then i add web reference to this web service in my client program and call the reference BBI. Then i call to the getAll function and get the error : There is an error in XML document (1, 63432). public List<BBI.myObject> getAll() { BBI.BBI bbi = new BBI.BBI(); List<BBI.myObject> allBooks = bbi.getAll().OfType<BBI.myObject>().ToList(); return allBooks; } Here is the total exception detail System.InvalidOperationException was unhandled by user code Message=There is an error in XML document (1, 71897). Source=System.Xml StackTrace: at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events) at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle) at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall) at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters) at BBI.BBI.getAllBooks() in c:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\vefur\73db60db\a4ee31dd\App_WebReferences.jl1r8jv6.0.cs:line 252 at webServiceFuncions.getAllBooks() in c:\Documents and Settings\forritari\Desktop\Vefur - Nýr\BBI\trunk\Vefur\App_Code\webServiceFuncions.cs:line 59 InnerException: System.Xml.XmlException Message='', hexadecimal value 0x01, is an invalid character. Line 1, position 71897. Source=System.Xml LineNumber=1 LinePosition=71897 SourceUri="" StackTrace: at System.Xml.XmlTextReaderImpl.Throw(Exception e) at System.Xml.XmlTextReaderImpl.Throw(String res, String[] args) at System.Xml.XmlTextReaderImpl.Throw(Int32 pos, String res, String[] args) at System.Xml.XmlTextReaderImpl.ParseNumericCharRefInline(Int32 startPos, Boolean expand, StringBuilder internalSubsetBuilder, Int32& charCount, EntityType& entityType) at System.Xml.XmlTextReaderImpl.ParseCharRefInline(Int32 startPos, Int32& charCount, EntityType& entityType) at System.Xml.XmlTextReaderImpl.ParseText(Int32& startPos, Int32& endPos, Int32& outOrChars) at System.Xml.XmlTextReaderImpl.ParseText() at System.Xml.XmlTextReaderImpl.ParseElementContent() at System.Xml.XmlTextReaderImpl.Read() at System.Xml.XmlTextReader.Read() at System.Xml.XmlReader.ReadElementString() at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderBBI.Read2_Book(Boolean isNullable, Boolean checkType) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderBBI.Read20_getAllBooksResponse() at Microsoft.Xml.Serialization.GeneratedAssembly.ArrayOfObjectSerializer35.Deserialize(XmlSerializationReader reader) at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events) InnerException: The database records are containing all kind of strange symbols, for example ¤rmann Kr. Einarsson and Tv” ‘fint˜ri Can someone see what im doing wrong here?

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Unable to connect SQL Server instance from Visual Studio 2008 Version 9.0

- by salvationishere

I am getting the below error from VS on an 32-bit XP Professional server even though I set Tools-Options-Database Tools-Data Connections to "SIDEKICK", which is the name of my computer. In other words SIDEKICK should default to the full SQLSERVER. In other words, I want VS to use SQLSERVER instead of SQLSERVER EXPRESS. And I can clearly see my database both from VS in the Server Explorer and also in SSMS 2008. Furthermore, I can view the tables of this database in Server Explorer from VS. I do not get any build errors. And it looks like all of the naming is consistent in my web.config file. I am developing my website according to a Microsoft tutorial, so I should not be getting an error. Yet I get the following exception when I run this code below: CreateAccounts.aspx.cs file protected void CreateAccountButton_Click(object sender, EventArgs e) { MembershipCreateStatus createStatus; //This line below is where the exception occurs MembershipUser newUser = Membership.CreateUser(Username.Text, Password.Text, Email.Text, passwordQuestion, SecurityAnswer.Text, true, out createStatus); And here is what the exception looks like: System.Web.HttpException was unhandled by user code Message="Unable to connect to SQL Server database." Source="System.Web" ErrorCode=-2147467259 StackTrace: at System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) at System.Web.DataAccess.SqlConnectionHelper.EnsureSqlExpressDBFile(String connectionString) at System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) at System.Web.Security.SqlMembershipProvider.CreateUser(String username, String password, String email, String passwordQuestion, String passwordAnswer, Boolean isApproved, Object providerUserKey, MembershipCreateStatus& status) at System.Web.Security.Membership.CreateUser(String username, String password, String email, String passwordQuestion, String passwordAnswer, Boolean isApproved, Object providerUserKey, MembershipCreateStatus& status) at System.Web.Security.Membership.CreateUser(String username, String password, String email, String passwordQuestion, String passwordAnswer, Boolean isApproved, MembershipCreateStatus& status) at Membership_CreatingUserAccounts.CreateAccountButton_Click(Object sender, EventArgs e) in c:\Documents and Settings\Admin\My Documents\Visual Studio 2008\WebSites\WebSite2\Membership\CreatingUserAccounts.aspx.cs:line 24 at System.Web.UI.WebControls.Button.OnClick(EventArgs e) at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) InnerException: System.Web.HttpException Message="Unable to connect to SQL Server database." Source="System.Web" ErrorCode=-2147467259 StackTrace: at System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) at System.Web.Management.SqlServices.SetupApplicationServices(String server, String user, String password, Boolean trusted, String connectionString, String database, String dbFileName, SqlFeatures features, Boolean install) at System.Web.Management.SqlServices.Install(String database, String dbFileName, String connectionString) at System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) InnerException: System.Data.SqlClient.SqlException Message="The user instance login flag is not supported on this version of SQL Server. The connection will be closed." Source=".Net SqlClient Data Provider" ErrorCode=-2146232060 Class=14 LineNumber=65536 Number=18493 Procedure="" Server="." State=1 StackTrace: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) at System.Data.SqlClient.SqlInternalConnectionTds.CompleteLogin(Boolean enlistOK) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) InnerException: The web.config connection string looks like: <connectionStrings> <add name="SecurityTutorialsConnectionString" connectionString="data source=.;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|SecurityTutorialsDatabase3.mdf;User Instance=true" providerName="System.Data.SqlClient"/> </connectionStrings> <system.web> <membership defaultProvider="SecurityTutorialsSqlMembershipProvider"> <providers> <add name="SecurityTutorialsSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="SecurityTutorialsConnectionString" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="true" applicationName="SecurityTutorials" requiresUniqueEmail="true" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="7" minRequiredNonalphanumericCharacters="1" passwordAttemptWindow="10" passwordStrengthRegularExpression=""/> </providers> </membership>

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[C#][Design] Appropriate programming design questions.

- by Edward

I have a few questions on good programming design. I'm going to first describe the project I'm building so you are better equipped to help me out. I am coding a Remote Assistance Tool similar to TeamViewer, Microsoft Remote Desktop, CrossLoop. It will incorporate concepts like UDP networking (using Lidgren networking library), NAT traversal (since many computers are invisible behind routers nowadays), Mirror Drivers (using DFMirage's Mirror Driver (http://www.demoforge.com/dfmirage.htm) for realtime screen grabbing on the remote computer). That being said, this program has a concept of being a client-server architecture, but I made only one program with both the functionality of client and server. That way, when the user runs my program, they can switch between giving assistance and receiving assistance without having to download a separate client or server module. I have a Windows Form that allows the user to choose between giving assistance and receiving assistance. I have another Windows Form for a file explorer module. I have another Windows Form for a chat module. I have another Windows Form form for a registry editor module. I have another Windows Form for the live control module. So I've got a Form for each module, which raises the first question: 1. Should I process module-specific commands inside the code of the respective Windows Form? Meaning, let's say I get a command with some data that enumerates the remote user's files for a specific directory. Obviously, I would have to update this on the File Explorer Windows Form and add the entries to the ListView. Should I be processing this code inside the Windows Form though? Or should I be handling this in another class (although I have to eventually pass the data to the Form to draw, of course). Or is it like a hybrid in which I process most of the data in another class and pass the final result to the Form to draw? So I've got like 5-6 forms, one for each module. The user starts up my program, enters the remote machine's ID (not IP, ID, because we are registering with an intermediary server to enable NAT traversal), their password, and connects. Now let's suppose the connection is successful. Then the user is presented with a form with all the different modules. So he can open up a File Explorer, or he can mess with the Registry Editor, or he can choose to Chat with his buddy. So now the program is sort of idle, just waiting for the user to do something. If the user opens up Live Control, then the program will be spending most of it's time receiving packets from the remote machine and drawing them to the form to provide a 'live' view. 2. Second design question. A spin off question #1. How would I pass module-specific commands to their respective Windows Forms? What I mean is, I have a class like "NetworkHandler.cs" that checks for messages from the remote machine. NetworkHandler.cs is a static class globally accessible. So let's say I get a command that enumerates the remote user's files for a specific directory. How would I "give" that command to the File Explorer Form. I was thinking of making an OnCommandReceivedEvent inside NetworkHandler, and having each form register to that event. When the NetworkHandler received a command, it would raise the event, all forms would check it to see if it was relevant, and the appropriate form would take action. Is this an appropriate/the best solution available? 3. The networking library I'm using, Lidgren, provides two options for checking networking messages. One can either poll ReadMessage() to return null or a message, or one can use an AutoResetEvent OnMessageReceived (I'm guessing this is like an event). Which one is more appropriate?

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Appropriate programming design questions.

- by Edward

I have a few questions on good programming design. I'm going to first describe the project I'm building so you are better equipped to help me out. I am coding a Remote Assistance Tool similar to TeamViewer, Microsoft Remote Desktop, CrossLoop. It will incorporate concepts like UDP networking (using Lidgren networking library), NAT traversal (since many computers are invisible behind routers nowadays), Mirror Drivers (using DFMirage's Mirror Driver (http://www.demoforge.com/dfmirage.htm) for realtime screen grabbing on the remote computer). That being said, this program has a concept of being a client-server architecture, but I made only one program with both the functionality of client and server. That way, when the user runs my program, they can switch between giving assistance and receiving assistance without having to download a separate client or server module. I have a Windows Form that allows the user to choose between giving assistance and receiving assistance. I have another Windows Form for a file explorer module. I have another Windows Form for a chat module. I have another Windows Form form for a registry editor module. I have another Windows Form for the live control module. So I've got a Form for each module, which raises the first question: 1. Should I process module-specific commands inside the code of the respective Windows Form? Meaning, let's say I get a command with some data that enumerates the remote user's files for a specific directory. Obviously, I would have to update this on the File Explorer Windows Form and add the entries to the ListView. Should I be processing this code inside the Windows Form though? Or should I be handling this in another class (although I have to eventually pass the data to the Form to draw, of course). Or is it like a hybrid in which I process most of the data in another class and pass the final result to the Form to draw? So I've got like 5-6 forms, one for each module. The user starts up my program, enters the remote machine's ID (not IP, ID, because we are registering with an intermediary server to enable NAT traversal), their password, and connects. Now let's suppose the connection is successful. Then the user is presented with a form with all the different modules. So he can open up a File Explorer, or he can mess with the Registry Editor, or he can choose to Chat with his buddy. So now the program is sort of idle, just waiting for the user to do something. If the user opens up Live Control, then the program will be spending most of it's time receiving packets from the remote machine and drawing them to the form to provide a 'live' view. 2. Second design question. A spin off question #1. How would I pass module-specific commands to their respective Windows Forms? What I mean is, I have a class like "NetworkHandler.cs" that checks for messages from the remote machine. NetworkHandler.cs is a static class globally accessible. So let's say I get a command that enumerates the remote user's files for a specific directory. How would I "give" that command to the File Explorer Form. I was thinking of making an OnCommandReceivedEvent inside NetworkHandler, and having each form register to that event. When the NetworkHandler received a command, it would raise the event, all forms would check it to see if it was relevant, and the appropriate form would take action. Is this an appropriate/the best solution available? 3. The networking library I'm using, Lidgren, provides two options for checking networking messages. One can either poll ReadMessage() to return null or a message, or one can use an AutoResetEvent OnMessageReceived (I'm guessing this is like an event). Which one is more appropriate?

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Right code to retrieve data from sql server database

- by HasanGursoy

Hi, I have some problems in database connection and wonder if I have something wrong in my code. Please review. This question is related: Switch between databases, use two databases simultaneously question. cs="Data Source=mywebsite.com;Initial Catalog=database;User Id=root;Password=toor;Connect Timeout=10;Pooling='true';" using (SqlConnection cnn = new SqlConnection(WebConfigurationManager.ConnectionStrings["cs"].ConnectionString)) { using (SqlCommand cmmnd = new SqlCommand("", cnn)) { try { cnn.Open(); #region Header & Description cmmnd.Parameters.Add("@CatID", SqlDbType.Int).Value = catId; cmmnd.CommandText = "SELECT UpperID, Title, Description FROM Categories WHERE CatID=@CatID;"; string mainCat = String.Empty, rootCat = String.Empty; using (SqlDataReader rdr = cmmnd.ExecuteReader()) { if (rdr.Read()) { mainCat = rdr["Title"].ToString(); upperId = Convert.ToInt32(rdr["UpperID"]); description = rdr["Title"]; } else { Response.Redirect("/", false); } } if (upperId > 0) //If upper category exists add its name { cmmnd.Parameters["@CatID"].Value = upperId; cmmnd.CommandText = "SELECT Title FROM Categories WHERE CatID=@CatID;"; using (SqlDataReader rdr = cmmnd.ExecuteReader()) { if (rdr.Read()) { rootCat = "<a href='x.aspx'>" + rdr["Title"] + "</a> » "; } } } #endregion #region Sub-Categories if (upperId == 0) //show only at root categories { cmmnd.Parameters["@CatID"].Value = catId; cmmnd.CommandText = "SELECT Count(CatID) FROM Categories WHERE UpperID=@CatID;"; if (Convert.ToInt32(cmmnd.ExecuteScalar()) > 0) { cmmnd.CommandText = "SELECT CatID, Title FROM Categories WHERE UpperID=@CatID ORDER BY Title;"; using (SqlDataReader rdr = cmmnd.ExecuteReader()) { while (rdr.Read()) { subcat.InnerHtml += "<a href='x.aspx'>" + rdr["Title"].ToString().ToLower() + "</a>\n"; description += rdr["Title"] + ", "; } } } } #endregion } catch (Exception ex) { HasanG.LogException(ex, Request.RawUrl, HttpContext.Current); Response.Redirect("/", false); } finally { cnn.Close(); } } } The random errors I'm receiving are: A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.) A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached. Cannot open database "db" requested by the login. The login failed. Login failed for user 'root'.

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Two-way databinding of a custom templated control. Eval works, but not Bind.

- by Jason

I hate long code snippets and I'm sorry about this one, but it turns out that this asp.net stuff can't get much shorter and it's so specific that I haven't been able to generalize it without a full code listing. I just want simple two-way, declarative databinding to a single instance of an object. Not a list of objects of a type with a bunch of NotImplementedExceptions for Add, Delete, and Select, but just a single view-state persisted object. This is certainly something that can be done but I've struggled with an implementation for years. This newest, closest implementation was inspired by this article from 4-Guys-From-Rolla, http://msdn.microsoft.com/en-us/library/aa478964.aspx. Unfortunately, after implementing, I'm getting the following error and I don't know what I'm missing: System.InvalidOperationException: Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control. If I don't use Bind(), and only use Eval() functionality, it works. In that way, the error is especially confusing. Here's the simplified codeset that still produces the error: using System.ComponentModel; namespace System.Web.UI.WebControls.Special { public class SampleFormData { public string SampleString = "Sample String Data"; public int SampleInt = -1; } [ToolboxItem(false)] public class SampleSpecificFormDataContainer : WebControl, INamingContainer { SampleSpecificEntryForm entryForm; internal SampleSpecificEntryForm EntryForm { get { return entryForm; } } [Bindable(true), Category("Data")] public string SampleString { get { return entryForm.FormData.SampleString; } set { entryForm.FormData.SampleString = value; } } [Bindable(true), Category("Data")] public int SampleInt { get { return entryForm.FormData.SampleInt; } set { entryForm.FormData.SampleInt = value; } } internal SampleSpecificFormDataContainer(SampleSpecificEntryForm entryForm) { this.entryForm = entryForm; } } public class SampleSpecificEntryForm : WebControl, INamingContainer { #region Template private IBindableTemplate formTemplate = null; [Browsable(false), DefaultValue(null), TemplateContainer(typeof(SampleSpecificFormDataContainer), ComponentModel.BindingDirection.TwoWay), PersistenceMode(PersistenceMode.InnerProperty)] public virtual IBindableTemplate FormTemplate { get { return formTemplate; } set { formTemplate = value; } } #endregion #region Viewstate SampleFormData FormDataVS { get { return (ViewState["FormData"] as SampleFormData) ?? new SampleFormData(); } set { ViewState["FormData"] = value; SaveViewState(); } } #endregion public override ControlCollection Controls { get { EnsureChildControls(); return base.Controls; } } private SampleSpecificFormDataContainer formDataContainer = null; [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)] public SampleSpecificFormDataContainer FormDataContainer { get { EnsureChildControls(); return formDataContainer; } } [Bindable(true), Browsable(false)] public SampleFormData FormData { get { return FormDataVS; } set { FormDataVS = value; } } protected override void CreateChildControls() { if (!this.ChildControlsCreated) { Controls.Clear(); formDataContainer = new SampleSpecificFormDataContainer(this); Controls.Add(formDataContainer); FormTemplate.InstantiateIn(formDataContainer); this.ChildControlsCreated = true; } } public override void DataBind() { CreateChildControls(); base.DataBind(); } } } With an ASP.NET page the following: <%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeBehind="Default2.aspx.cs" Inherits="EntryFormTest._Default2" EnableEventValidation="false" %> <%@ Register Assembly="EntryForm" Namespace="System.Web.UI.WebControls.Special" TagPrefix="cc1" %> <asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent"> </asp:Content> <asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <h2> Welcome to ASP.NET! </h2> <cc1:SampleSpecificEntryForm ID="EntryForm1" runat="server"> <FormTemplate> <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("SampleString") %>'></asp:TextBox><br /> <h3>(<%# Container.SampleString %>)</h3><br /> <asp:Button ID="Button1" runat="server" Text="Button" /> </FormTemplate> </cc1:SampleSpecificEntryForm> </asp:Content> Default2.aspx.cs using System; namespace EntryFormTest { public partial class _Default2 : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { EntryForm1.DataBind(); } } } Thanks for any help!

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WebClient.DownloadDataAsync is freezing my UI

- by Matías

Hi, I have in my Form constructor, after the InitializeComponent the following code: using (WebClient client = new WebClient()) { client.DownloadDataCompleted += new DownloadDataCompletedEventHandler(client_DownloadDataCompleted); client.DownloadDataAsync("http://example.com/version.txt"); } When I start my form, the UI doesn't appears till client_DownloadDataCompleted is raised. The client_DownloadDataCompleted method is empty, so there's no problem there. What I'm doing wrong? How is supposed to do this without freezing the UI? Thanks for your time. Best regards. FULL CODE: Program.cs using System; using System.Windows.Forms; namespace Lala { static class Program { /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } } } Form1.cs using System; using System.Net; using System.Windows.Forms; namespace Lala { public partial class Form1 : Form { WebClient client = new WebClient(); public Form1() { client.DownloadDataCompleted += new DownloadDataCompletedEventHandler(client_DownloadDataCompleted); client.DownloadDataAsync(new Uri("http://www.google.com")); InitializeComponent(); } void client_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e) { textBox1.Text += "A"; } } partial class Form1 { /// <summary> /// Required designer variable. /// </summary> private System.ComponentModel.IContainer components = null; /// <summary> /// Clean up any resources being used. /// </summary> /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows Form Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { this.button1 = new System.Windows.Forms.Button(); this.textBox1 = new System.Windows.Forms.TextBox(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(12, 12); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(75, 23); this.button1.TabIndex = 0; this.button1.Text = "button1"; this.button1.UseVisualStyleBackColor = true; // // textBox1 // this.textBox1.Location = new System.Drawing.Point(12, 41); this.textBox1.Multiline = true; this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(468, 213); this.textBox1.TabIndex = 1; // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(492, 266); this.Controls.Add(this.textBox1); this.Controls.Add(this.button1); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); this.PerformLayout(); } #endregion private System.Windows.Forms.Button button1; private System.Windows.Forms.TextBox textBox1; } }

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jQuery Validation in ASP.NET

- by Abu Hamzah

i have a strange situation may its a easy fix or something i may be missing but here is the question. i have a asp.net form with master page and my validation works great without any problem but the problems starts when i try to hook my click event to the server side, here is what i meant: i have a form with few fields on it and if the form is empty than it should STOP submitting, otherwise allow me to execute the server side script but its not happening, even my form is in invalid state (i do get error message saying i have to enter the required fileds) but still executing my server side script. i would like to execute my server side script only if the form is in valid state. here is my code: my master page <%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>jQuery Validation in ASP.NET Master Page</title> <script src="Scripts/jquery-1.3.2.js" type="text/javascript"></script> <script src="Scripts/jquery-1.3.2-vsdoc2.js" type="text/javascript"></script> <script src="Scripts/jquery.validate.js" type="text/javascript"></script> <asp:ContentPlaceHolder id="head" runat="server"> </asp:ContentPlaceHolder> </head> <body> <form id="form1" runat="server"> <div> <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </div> </form> </body> </html> my content page: <%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <script type="text/javascript"> $(document).ready(function() { $("#aspnetForm").validate({ rules: { <%=txtName.UniqueID %>: { minlength: 2, required: true }, <%=txtEmail.UniqueID %>: { required: true, email:true } }, messages: { <%=txtName.UniqueID %>:{ required: "* Required Field *", minlength: "* Please enter atleast 2 characters *" } } }); }); </script> Name: <asp:TextBox ID="txtName" MaxLength="30" runat="server" /><br /> Email: <asp:TextBox ID="txtEmail" runat="server"></asp:TextBox><br /> <asp:Button ID="btnSubmit" runat="server" onclick="SubmitTheForm();" Text="Submit" /> </asp:Content> function SubmitTheForm() { SaveTheForm(); } function SaveTheForm() { debugger; var request = buildNewContactRequest(); ContactServiceProxy.invoke({ serviceMethod: "PostNewContact", data: { request: request }, callback: function(response) { processCompletedContactStore(response); }, error: function(xhr, errorMsg, thrown) { postErrorAndUnBlockUI(xhr, errorMsg, thrown); } }); return false; }

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How to figure out who owns a worker thread that is still running when my app exits?

- by Dave

Not long after upgrading to VS2010, my application won't shut down cleanly. If I close the app and then hit pause in the IDE, I see this: The problem is, there's no context. The call stack just says [External code], which isn't too helpful. Here's what I've done so far to try to narrow down the problem: deleted all extraneous plugins to minimize the number of worker threads launched set breakpoints in my code anywhere I create worker threads (and delegates + BeginInvoke, since I think they are labeled "Worker Thread" in the debugger anyway). None were hit. set IsBackground = true for all threads While I could do the next brute force step, which is to roll my code back to a point where this didn't happen and then look over all of the change logs, this isn't terribly efficient. Can anyone recommend a better way to figure this out, given the notable lack of information presented by the debugger? The only other things I can think of include: read up on WinDbg and try to use it to stop anytime a thread is started. At least, I thought that was possible... :) comment out huge blocks of code until the app closes properly, then start uncommenting until it doesn't. UPDATE Perhaps this information will be of use. I decided to use WinDbg and attach to my application. I then closed it, and switched to thread 0 and dumped the stack contents. Here's what I have: ThreadCount: 6 UnstartedThread: 0 BackgroundThread: 1 PendingThread: 0 DeadThread: 4 Hosted Runtime: no PreEmptive GC Alloc Lock ID OSID ThreadOBJ State GC Context Domain Count APT Exception 0 1 1c70 005a65c8 6020 Enabled 02dac6e0:02dad7f8 005a03c0 0 STA 2 2 1b20 005b1980 b220 Enabled 00000000:00000000 005a03c0 0 MTA (Finalizer) XXXX 3 08504048 19820 Enabled 00000000:00000000 005a03c0 0 Ukn XXXX 4 08504540 19820 Enabled 00000000:00000000 005a03c0 0 Ukn XXXX 5 08516a90 19820 Enabled 00000000:00000000 005a03c0 0 Ukn XXXX 6 08517260 19820 Enabled 00000000:00000000 005a03c0 0 Ukn 0:008> ~0s eax=c0674960 ebx=00000000 ecx=00000000 edx=00000000 esi=0040f320 edi=005a65c8 eip=76c37e47 esp=0040f23c ebp=0040f258 iopl=0 nv up ei pl nz na po nc cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000202 USER32!NtUserGetMessage+0x15: 76c37e47 83c404 add esp,4 0:000> !clrstack OS Thread Id: 0x1c70 (0) Child SP IP Call Site 0040f274 76c37e47 [InlinedCallFrame: 0040f274] 0040f270 6baa8976 DomainBoundILStubClass.IL_STUB_PInvoke(System.Windows.Interop.MSG ByRef, System.Runtime.InteropServices.HandleRef, Int32, Int32)*** WARNING: Unable to verify checksum for C:\Windows\assembly\NativeImages_v4.0.30319_32\WindowsBase\d17606e813f01376bd0def23726ecc62\WindowsBase.ni.dll 0040f274 6ba924c5 [InlinedCallFrame: 0040f274] MS.Win32.UnsafeNativeMethods.IntGetMessageW(System.Windows.Interop.MSG ByRef, System.Runtime.InteropServices.HandleRef, Int32, Int32) 0040f2c4 6ba924c5 MS.Win32.UnsafeNativeMethods.GetMessageW(System.Windows.Interop.MSG ByRef, System.Runtime.InteropServices.HandleRef, Int32, Int32) 0040f2dc 6ba8e5f8 System.Windows.Threading.Dispatcher.GetMessage(System.Windows.Interop.MSG ByRef, IntPtr, Int32, Int32) 0040f318 6ba8d579 System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame) 0040f368 6ba8d2a1 System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame) 0040f374 6ba7fba0 System.Windows.Threading.Dispatcher.Run() 0040f380 62e6ccbb System.Windows.Application.RunDispatcher(System.Object)*** WARNING: Unable to verify checksum for C:\Windows\assembly\NativeImages_v4.0.30319_32\PresentationFramewo#\7f91eecda3ff7ce478146b6458580c98\PresentationFramework.ni.dll 0040f38c 62e6c8ff System.Windows.Application.RunInternal(System.Windows.Window) 0040f3b0 62e6c682 System.Windows.Application.Run(System.Windows.Window) 0040f3c0 62e6c30b System.Windows.Application.Run() 0040f3cc 001f00bc MyApplication.App.Main() [C:\code\trunk\MyApplication\obj\Debug\GeneratedInternalTypeHelper.g.cs @ 24] 0040f608 66c421db [GCFrame: 0040f608] EDIT -- not sure if this helps, but the main thread's call stack looks like this: [Managed to Native Transition] > WindowsBase.dll!MS.Win32.UnsafeNativeMethods.GetMessageW(ref System.Windows.Interop.MSG msg, System.Runtime.InteropServices.HandleRef hWnd, int uMsgFilterMin, int uMsgFilterMax) + 0x15 bytes WindowsBase.dll!System.Windows.Threading.Dispatcher.GetMessage(ref System.Windows.Interop.MSG msg, System.IntPtr hwnd, int minMessage, int maxMessage) + 0x48 bytes WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame = {System.Windows.Threading.DispatcherFrame}) + 0x85 bytes WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame frame) + 0x49 bytes WindowsBase.dll!System.Windows.Threading.Dispatcher.Run() + 0x4c bytes PresentationFramework.dll!System.Windows.Application.RunDispatcher(object ignore) + 0x17 bytes PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window) + 0x6f bytes PresentationFramework.dll!System.Windows.Application.Run(System.Windows.Window window) + 0x26 bytes PresentationFramework.dll!System.Windows.Application.Run() + 0x1b bytes I did a search on it and found some posts related to WPF GUIs hanging, and maybe that'll give me some more clues.

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Ctrl F5 exception and ignored on F5

- by user575219

I am getting this unhandled exception error shown: See screen shot. I am getting this error only when I run with Ctrl+ F5 and not in F5(debug mode).Not sure if this is helpful,my computer is a windows 7- 64bit and running a 32 bit build According to this discussion: How can I get WinForms to stop silently ignoring unhandled exceptions?, Adding Application.SetUnhandledExceptionMode(UnhandledExceptionMode.ThrowException) iwll cause Windows to ignore the error. EDIT: frmPlant_Load Event public partial class frmPlant : Form { DatabaseConnection _DbConnection = new DatabaseConnection(); string conString = ConfigurationManager.ConnectionStrings["RVESTConnString"].ConnectionString; SQLQueries _SQlQueries = new SQLQueries(); DataSet ds; SQLiteDataAdapter da; static DataTable gdt; int gSelectedPlant; string gSelectedPlantName = ""; bool ignoreSelChg = false; bool DataDirty = false; public frmPlant() { InitializeComponent(); } public frmPlant(int sSelectedPlant) { InitializeComponent(); } private void frmPlant_Load(object sender, EventArgs e) { ds = FillData(); gdt = ds.Tables[0]; bindingSource1.DataSource = gdt; dataGridView1.DataSource = bindingSource1; gSelectedPlant = StaticClass.GlobalValue; dataGridView1.AutoGenerateColumns = true; dataGridView1.Columns["PlantId"].Visible = false; dataGridView1.Columns["NSSS_Design"].Width = 70; } private DataSet FillData() { ignoreSelChg = true; SQLiteConnection con = new SQLiteConnection(conString); DataSet dPlant; try { con.Open(); SQLiteCommand cmd = new SQLiteCommand("select * from Plant", con); da = new SQLiteDataAdapter("select * from Plant", con); dPlant = new DataSet(); da.Fill(dPlant, "plant"); } catch (Exception ex) { throw ex; } finally { con.Close(); } return dPlant; } I should also add another concern: When I say continue here in the dialog, it works fine but leaves a background process running. I have to manually go and kill it in the task manager Question: Suppose I add this line in the Program.cs, will it ignore ANY- even genuine errors which need to be fixed? More Code: This dialog pops up on button click on the second screen- Initial Setup screen . The first being a splash screen. Initial setup takes me to the Plant form Here's the code for the initial setup screen public partial class frmInitialSetUp : Form { public frmInitialSetUp() { InitializeComponent(); } private void btnOK_Click(object sender, EventArgs e) { Program.fPlant = new frmPlant(); Program.fPlant.Show(); this.Hide(); } private void frmInitialSetUp_Load(object sender, EventArgs e) { Program.LoadAllForms(); } } } Program.cs static public void LoadAllForms() { try { Program.fInitialSetUp = new frmInitialSetUp(); Program.fPlant = new frmPlant(); Program.frm*** = new frm***(); Program.frm*** = new frm***(); Program.frm*** = new frm***(); } catch (Exception ex) { throw ex; } } On button click on the

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