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• ASP.NET Ajax Error: Sys.WebForms.PageRequestManagerParserErrorException

  - by Phil Bennett

  My website has been giving me intermittent errors when trying to perform any Ajax activities. The message I get is Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled. Details: Error parsing near ' So its obviously some sort of server timeout or the server's just returning back mangled garbage. This generally, unfortunately not always, happens when the site has been idle for a while. Anybody else been able to overcome this? Thanks

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• ASP.NET MVC 2 controller-url problems

  - by cc0

  I am still very new to the MVC framework, but I managed to create a controller that reads from a database and writes JSON to an url; host.com/Controllername?minValue=something&maxValue=something However when I move the site to a subfolder; host.com/mvc/ it doesn't seem to be able to call the controller from there when I do it like this; host.com/mvc/Controllername?minValue=something&maxValue=something Did I forget to do something somewhere to make this url call valid from that subfolder? Any help here would be greatly appreciated.

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• Global Import Aliasing in .NET

  - by Josh Stodola

  Using import aliasing in a single class, we can reference class library namespaces by assigning our own custom alias like this: Imports Db = Company.Lib.Data.Objects And then we are able to reference the classes inside of Company.Lib.Data.Objects by using the Db alias that we assigned. Is it possible to do this at the global level so that the alias is applied to the entire solution instead of the given file? Currently, we are working with web applications, so I was hoping we could add something to web.config, but I am also interested in whether or not this is possible with windows forms, console apps, and/or class libraries.

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• C# ASP.NET Error message when non-numberic value in textbox

  - by ilkdrl

  If a user enters a non-numeric value into the textbox and presses button, I should see an "ERROR" message in a label. How can I achieve this?

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• Create a real time web application using .net framework and azure - very confused

  - by test

  Let us say I would like a simple (yet complex) web application where there is continuous READING AND WRITING to the sql azure database. Let us say I am tracking a location, and I would like it to be updated very frequently (lets take the worst case: 1 second). From the little knowledge I have, I think that this involves the use of the database to continuously write the location to the database, and continuously read from the database to update another person through a website. Do you please have any suggestion which technologies can I use? Is there a simple way? I heard about node.js, signalR. I have no idea how to use them, if they are really what I need. the last tutorial I checked out simply uses a while(true) loop..but I don't think that that's something good to keep a thread continuously busy... Do I have to create some background task? Do I have to create some web service? This is a school project and I wish not to go for the most difficult option, but if there is some sort of solution, challenge accepted :) Can you please help me? Since I have asked many questions here and yet I have no solution in mind

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• ASP.NET MCV 2 controller-url problems

  - by cc0

  I am still very new to the MVC framework, but I managed to create a controller that reads from a database and writes JSON to an url; host.com/Controllername?minValue=something&maxValue=something However when I move the site to a subfolder; host.com/mvc/ it doesn't seem to be able to call the controller from there when I do it like this; host.com/mvc/Procedure?minValue=something&maxValue=something Did I forget to do something somewhere to make this url call valid from that subfolder? Any help here would be greatly appreciated.

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• Html.CheckBoxFor() checked problem in ASP.Net MVC 2

  - by inolen

  It doesn't seem that the Html.CheckBoxFor helper adds the correct "checked" attribute when rendering the HTML. I have a bool property rendered like so: <%= Html.CheckBoxFor(m => m.Visible) %> And the outputted HTML is this: <input type="checkbox" value="true" name="Visible" id="Visible"> Is there some particular reason it does not add the "checked" attribute when the value is true?

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• Asp.Net MVC Handle Drop Down Boxes that are not part of the Model

  - by Pino

  I have a small form which the user must fill in and consists of the following fields. Name (Text) Value (Text) Group (Group - Is a list of option pulled from a database table) Now the Model for this View looks like so, public string Name { get; set; } public string Value { get; set; } public int GroupID { get; set; } Now the view is Strongly Typed to the above model. What method would one use to populate the drop down list? Since the data is not contained within the Model (It could be contained in the Model) should we be using Temp/View data? A HTML Helper? What would be the ideal way to achieve this.

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• ASP.Net URL rewirting and redirecting....

  - by DDiVita

  I am trying to wrap my head around a URL rewrtie / redirect project I need to work on. We currently have this url: www.domain.com/Details/Detail.aspx?param1=8&param2=12345 Here is what the rewritten URL will look like: www.domain.com/Param1/8/Param2/12345 I am using the ISAPI_Rewrite filter to allow for the "nice" url and make the page think it is still using the old url. That works fine. Now, I need to redirect users, if they use the old URL, to the new URL. I fgiure I would need to use a combination of the filter and an HTTPModule / Handler to perfomr the redirect. Any ideas?

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• Simple ASP.NET MVC Routing question

  - by Robert

  Hi there, I have two pages in my simple MVC App with two defined routes: routes.MapRoute( "Results", // Route name "Results/{id}", // URL with parameters new { controller = "Results", action = "Index", id = "" } // Parameter defaults ); routes.MapRoute( "Default", // Route name "{controller}/{action}/{id}", // URL with parameters new { controller = "Main", action = "Index", id = UrlParameter.Optional } // Parameter defaults ); I needed to have the results page load with just a product ID such as this: [MyDomain....]/Results/12345. But also the main page does a POST (using JQuery) to the Results Controller for updates using this route: [MyDomain....]/Main/Update along with a data bag. This works fine when I only have the "Default" route. But when I added the other "Results" route, all the POST calls to update are failing. Any ideas what I'm doing wrong??? Thanks a lot.

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• Trouble with ASP.NET MVC auto-scaffolder template

  - by DanM

  I'm trying to write an auto-scaffolder template for Index views. I'd like to be able to pass in a collection of models or view-models (e.g., IQueryable<MyViewModel>) and get back an HTML table that uses the DisplayName attribute for the headings (th elements) and Html.Display(propertyName) for the cells (td elements). Each row should correspond to one item in the collection. Here's what I have so far: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> <% var items = (IQueryable<TestProj.ViewModels.TestViewModel>)Model; // How do I make this generic? var properties = items.First().GetMetadata().Properties .Where(pm => pm.ShowForDisplay && !ViewData.TemplateInfo.Visited(pm)); %> <table> <tr> <% foreach(var property in properties) { %> <th> <%= property.DisplayName %> </th> <% } %> </tr> <% foreach(var item in items) { HtmlHelper itemHtml = ????; // What should I put in place of "????"? %> <tr> <% foreach(var property in properties) { %> <td> <%= itemHtml.Display(property.DisplayName) %> </td> <% } %> </tr> <% } %> </table> Two problems with this: I'd like it to be generic. So, I'd like to replace var items = (IQueryable<TestProj.ViewModels.TestViewModel>)Model; with var items = (IQueryable<T>)Model; or something to that effect. A property Html is automatically created for me when the view is created, but this HtmlHelper applies to the whole collection. I need to somehow create an itemHtml object that applies just to the current item in the foreach loop. I'm not sure how to do this, however, because the constructors for HtmlHelper don't take a Model object. How do I solve these two problems?

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• .NET 2.0: Invoking Methods Using Reflection And Generics Causes Exception

  - by David Derringer

  Hi all, I'm new to Stack Overflow, so forgive me. I've just started transititoning over to C# and I am stuck on a problem. I am wanting to pass a generic class in and call a method from that class. So, my code looks as such: public void UpdateRecords<T>(T sender) where T : new() //where T: new() came from Resharper { Type foo = Type.GetType(sender.GetType().ToString()); object[] userParameters = new object[2]; userParameters[0] = x; userParameters[1] = y; sender = new T(); //This was to see if I could solve my exception problem MethodInfo populateRecord = foo.GetMethod("MethodInOtherClass"); populateMethod.Invoke(sender, userParameters); } Exception thrown: "Object reference not set to an instance of an object." Again, I really apologize, as I am nearly brand new to C# and this is the first time I've ever handled reflection and generics. Thank you!

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• Membership and asp.net MVC

  - by Jemes

  I’m building a site that needs users created with different roles and permissions to access different areas of the site. I using mvc 2 but I can’t find much clear guidance on using the Membership tool with mvc to create accounts and roles etc. I tried the web configuration tool which works but I would like to administrate the site remotely. I used the aspnet_regsql tool so I can access the SqlMembershipProvider Schema in my Database. I also need to add more information to a user like profile info and a picture, would I add these to the membership tables or create separate tables for this? Any advice or help would be really helpful? Thanks Jemes

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• Getting value from a texbox in asp.net

  - by user279521

  Hi, I have a web page which contains multiple panels (used to show and hide various textboxes) and one particular panel contains textboxes that is used to edit records. However, when I am attemtping to update the table, the txtVendorID.Text.Trim() is blank. SqlConnection con = new SqlConnection(strConn); string sqlUpdateVendor = "usp_Vendor_Update"; SqlCommand cmdUpdateVendor = new SqlCommand(sqlUpdateVendor, con); cmdUpdateVendor.CommandType = CommandType.StoredProcedure; cmdUpdateVendor.Parameters.Add(new SqlParameter("@RecID", SqlDbType.VarChar, 50)); cmdUpdateVendor.Parameters["@RecID"].Value = Request.QueryString["Rec_ID"]; cmdUpdateVendor.Parameters.Add(new SqlParameter("@empid", SqlDbType.VarChar, 11)); cmdUpdateVendor.Parameters["@empid"].Value = txtEmpIDNumber.Text.Trim(); cmdUpdateVendor.Parameters.Add(new SqlParameter("@VendorName", SqlDbType.VarChar, 100)); cmdUpdateVendor.Parameters["@VendorName"].Value = txtVendorName.Text.Trim(); Any idea why the textbox does not contain a value?

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• Disable VB.NET 10 Features in VS 2010

  - by Keivan

  is there a way to disable visual basic 10 language features in VS 2010. our Dev team has moved to Visual studio 2010, but we still have to keep backwards compatibility with Visual Studio 2008. is there a way to disable the new language features to avoid any issues.

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• ASP.NET MVC - hiding id in URL?

  - by mcfroob

  I'm building a basic blog application just now, for viewing data I'm just using the default route, i.e. - routes.MapRoute ( "Default", // Route name "{controller}/{action}/{id}", new { controller = "Blog", action = "Index", id = UrlParameter.Optional } ); So that when you go to mysite.com/View/12 it displays the blog with id 12. I want to modify the URLs so that they look as follows: mysite.com/View/2010/06/01/this-is-the-title. I could have a URL mapping like - routes.MapRoute( "View", "View/{year}/{month}/{day}/{title}", new { controller = "Blog", action = "View" } ); But then I'm not passing the ID into the Controller action so I would have to search on the date and title which doesn't feel right. On the other hand, if I pass the ID in it will show up in the URL which isn't what I'm aiming for either. Is there any way to redirect to the URL I want in the controller action after passing only the ID in as a paramter, or to pass the ID into the a Map Route but hide it in the URL? Thanks for your help!

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• VB.NET Window Screen Capture (ALT+PRINTSCREEN)

  - by Steve Thomas

  Hi, I found that code somewhere and I find it quite useful but I would like to find a way to make it work so it capture only the given window target. Maybe with a processID or Window Name. Even if that window is not active. I do not want to make that window active but want to get a screen capture like if I was doing Alt+PrintScreen on it. Here is the code that works for full Screen Capture Private bmpScreenShot As Bitmap Private gfxScreenshot As Graphics bmpScreenShot = New Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb) gfxScreenshot = Graphics.FromImage(bmpScreenShot) gfxScreenshot.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, Screen.PrimaryScreen.Bounds.Size, CopyPixelOperation.SourceCopy) bmpScreenShot.Save(fileName, ImageFormat.Png) I use the Visual Basic 2008 Express Thank you in advance!

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• asp.net MVC: how to get the previous action name

  - by Daoming Yang

  I can get the current action name by using the following code var currentActionName = ControllerContext.RouteData.GetRequiredString("action"); but is it possible to get the previous action name as well?

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• i don't know how to work with command argument in asp.net

  - by Depozitul de Chestii

  hey, i'm tryng to pass a parameter with command argument with a link button but the result i get is always "". this is in my aspx page: <% LinkButton1.CommandArgument = "abcdef"; %> <asp:LinkButton ID="LinkButton1" runat="server" OnCommand= "LinkButton1_Click"> and in my aspx.cs i have: protected void LinkButton1_Click(object sender,CommandEventArgs ee) { String id = ee.CommandName.ToString(); } the id is always "" after i press the linkbutton. would appreciate if someone could help me. thanks

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• Mdi Children Changed in .Net

  - by Ben

  Hi Is there a simple way of tracking the change of an Mdi's children i.e. when they are created and closed, something like an event OnMdiChildListChanged (I realise this doesn't actually exist). I am also aware that I could have a method within my Mdi that handles the creation of child forms and logs the state of them or even create an Interface that defines that a child form has a "NotifyParent" method that is then called on close of the form, but i was wondering if there was any built in events that i could plumb into? Thanks

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• asp.net web service OneWay definition not working

  - by jbrook10

  When I specify <SoapDocumentMethod(OneWay:=True)> on my webservice it doesn't seem to get called. If I remove that the webservice works properly. Also, everything works fine on the development machine just not on the server. Here is my web method: <SoapDocumentMethod(OneWay:=True)> _ <WebMethod()> _ Public Sub Write(ByVal processGroupId As Integer) xslClass.xslHelper.writeDatabase(processGroupId) ', processGroupName) End Sub Here is my calling code: Dim svc As New svcWriteFiles.WriteDatabaseService svc.WriteAsync(e.CommandArgument) Any ideas?

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• The cost of finalize in .Net

  - by Jules

  (1) I've read a lot of questions about IDisposable where the answers recommend not using Finalize unless you really need to because of the process time involved. What I haven't seen is how much this cost is and how often it's paid. Every millisecond? second? hour, day etc. (2) Also, it seems to me that Finalize is handy when its not always known if an object can be disposed. For instance, the framework font class. A control can't dispose of it because it doesn't know if the font is shared. The font is usually created at design time so the user won't know to dispose it, therefore finalize kicks in to finally get rid of it when there are no references left. Is that a correct impression?

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• POST Ajax call results in not found using jqGrid and ASP.NET MVC 2 on IIS6

  - by Dan

  This is puzzling me. I deployed an MVC 2 application to IIS6 and everything works fine except for my jqGrid calls to get data. All is well on my development machine, but here are the two URLs I'm working with Local dev web server: POST http://localhost:port/Ctrl.mvc/JsonMethod IIS6 (notice https - not sure if that matters) POST https://www.domain.com/AppName/Ctrl.mvc/JsonMethod The latter URL results in a HTTP 404, which is really confusing as all works well on my local machine. The JsonMethod is properly declared with [AcceptVerbs(HttpVerbs.Post)] Let me know if any more info is needed - I appreciate any and all help with this!

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• ASP .NET - What's going on behind an Eval() ?

  - by Amokrane

  Hi, I'm trying to understand how Eval() works for a specific purpose. I'm working on a project I don't really know and I need to read some data and put them in drop down list. These data are already read and are displayed inside an ItemTemplate. I noticed there are read using the Eval() method. Something like: <ItemTemplate> <a href="...=<%# Eval("foo") %>></a> </ItemTemplate> I need to know where Eval is getting these data from in order to discover where I should read them for my drop down list! But I didn't really understand how it works! I know that Eval() evaluates data binding expressions at runtime but where do you think I should take a look at? Thank you

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• Creating Reports in ASP.NET

  - by Norbs

  I have a crystal report in my application and it works fine but I want to ask if there's a way that the user can manipulate the report that he/she wants? For example, the user wants to create his/her own report. in my application, there are already reports available. They just need to click the link and it will show immediately the specific report. What if the user wants to create his/her own report? Is it possible???

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