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• Onpaint events (invalidated) changing execution order after a period normal operation (runtime)

  - by Luke Mcneice

  I have 3 data graphs that are painted via the their paint events. When I have data that I need to insert into the graph I call the controls invalidate() command. The first control's paint event actually creates a bitmap buffer for the other 2 graphs to avoid repeating a long loop. So the invalidate commands are in a specific order (1,2,3). This works well, however when the graphed data reaches the end of the graph window (PictureBox) where the data would normally start scrolling, the paint events begin firing in the wrong order (2,3,1). has anyone came across this before? why might this be happening?

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• Share data between usercontrols

  - by toraan

  On my page I have n-userControls (same control) I need to communicate between them(to be more specific I need to pass one in value) . I don't want to involve the hosting page for that. The controls acts as "pagers" and interact with the paged data on the hostin page via events that hosting page is subscribed to. So when user click on one of the pager and changes it's state, the other control should know about it and change itself accordingly. I can not use VieState because viewstate is per control and so is the controlstate. Can I use Session for that? (session is shared and there is only one value that i need to store) Or maybe there is something better I can use? (no QueryString)

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• Using SketchFlow to prototype MS Surface Applications

  - by Isak Savo

  Hi We're doing mockups/prototyping on a MS Surface device and I wonder if anyone has succeeded in using SketchFlow for this. The problem that I see is that the code generated by the tool uses normal WPF controls (Button, etc.) instead of the contact aware surface counterparts (SurfaceButton) which means that they won't work nice on the surface unless you also use a mouse. Additionally, it would be nice if it was possible to hook in to other gesture events to trigger sketchflow transitions. Like the pinch gestures to switch page etc. Has anyone had any success with prototyping for Surface using Sketchflow. If so, how did you do it?

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• Tools to test softwares against any attacks for programmers ?

  - by berkay

  in these days, i'm interested in software security. As i'm reading papers i see that there are many attacks and researchers are trying to invent new methods for softwares to get more secure systems. this question can be a general including all types of attacks.There are many experienced programmers in SO, i just want to learn what are using to check your code against these attacks ? Is there any tools you use or you don't care ? For example i heard about,static,dynamic code analysis, fuzz testing. SQL injection attacks Cross Site Scripting Bufferoverflow attacks Logic errors Any kind of Malwares Covert Channels ... ... thanks

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• "Tool tip" covered by ToolStripItems if they have dropdown items?

  - by Theis

  In Windows Forms - if the dropdown items of a MenuStrip has tooltips and dropdown items themselves the tooltip will have about a 50% chance of showing up below the ToolStripItems. What is the workaround? To repro you can create the MenuStrip in Visual Studio or just add the following code to a form and then try to hover your mouse over the menu items to get a tooltip: //Make a menu strip MenuStrip menu = new MenuStrip(); this.Controls.Add(menu); //Add category "File" ToolStripMenuItem fileItem = new ToolStripMenuItem("File"); menu.Items.Add(fileItem); //Add items for (int i = 0; i < 10; i++) { ToolStripMenuItem item = new ToolStripMenuItem("item"); item.ToolTipText = "item tooltip"; item.DropDownItems.Add("sub item"); fileItem.DropDownItems.Add(item); } I am using .NET 3.5

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• Can't make an array in C#

  - by Josh

  I'm trying to make a dynamic array in C# but I get an annoying error message. Here's my code: private void Form1_Load(object sender, EventArgs e) { int[] dataArray; Random random = new Random(); for (int i = 0; i < random.Next(1, 10); i++) { dataArray[i] = random.Next(1, 1000); } } And the error: Use of unassigned local variable 'dataArray' This is just baffling my mind. I came from VB, so please me gentle, lol. Cheers.

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• ASP.NET MVC Best Implementation Practices

  - by RSolberg

  I've recently been asked to completely rewrite and redesign a web site and the owner of the company has stressed that he wants the site to be made with the latest and greatest technology available, but to avoid additional costs. As of right now, I'm torn between looking into a CMS implementation and writing a new implementation with MVC. The site is mainly brochure ware, but will need to allow the visitors to submit some data through forms. There are quite a few lists and content features that are dynamic and should be treated as such. Since ASP.NET MVC is new, I don't want to bastardize the implementation if I go that way... Any recommendations on best implementation practices for a MVC website? Also, has anyone had their MVC implementation hosted anywhere that they would recommend?

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• When are ASP.NET Expression Builders most useful?

  - by SkippyFire

  I saw an example of using Expression Builders, and creating your own Custom Expression Builder Classes here: http://aspnet.4guysfromrolla.com/articles/022509-1.aspx However, I fail to see the value in using this approach. It doesn't seem much easier than programmatically setting values in your code behind. As far as I can tell, the only thing you can do with them is set properties. Maybe they would be useful for setting defaults on certain controls? Can anyone shed light on where this ASP.NET feature becomes powerful?

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• Load httpmodule to .aspx page

  - by Kumara

  I have created 3 textbox and 2 buttons programatically from HTTPModule. These buttons and textboxes are contained in an html table. It works correctly. I want know how load these table to existing .aspx page <div>***********</div> <div> Some controls contained here <div> I want load HTTPModule table in this place. </div> </div> Please help me. Give a good tutorial for creating a pluggable http module. Thanks.

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• HTML5 video on iPad

  - by mrollinsiv

  I have a dynamic video gallery and it works great on a computer. When moving to an iPad, the video starts loading and it shows the cannot play icon. Instead of this I'd rather the video not show until it's ready to play. I have tried to add events listeners for "canplaythrough" and "canplay" and when they occur for the video to fade in then play. Does the iPad not support these events? new_video = document.createElement('video'); new_video.setAttribute('class', 'none'); new_video.setAttribute('width', '568'); new_video.setAttribute('height', '269'); new_video.setAttribute('id', 'video'+video_num); current_video.insertBefore(new_video, video_controls); new_video.load(); new_video.addEventListener('canplaythrough', function() { $('#video'+video_num').fadeIn(100); new_video.play(); });

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• Trying to pass Model down to partial, how do I do this?

  - by mrblah

  My action creates a strongly typed viewdata, which is passed to my view. In the view, I pass the Model to the render partial method. public ActionResult Index() { ViewDataForIndex vd = new ViewDataForIndex(); vd.Users = Users.GetAll(); return View(vd); } public class ViewDataForIndex: ViewData { public IList<User> Users {get;set;} } now in the view: <%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<ViewDataForIndex>" %> <% Html.RenderPartial("~/controls/blah.ascx", ViewData.Model); %> and in blah.ascx: <%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> how do I access my model now? if I wanted to create a strongly typed class for my ViewUserControl, how would I do that? inherit from?

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• Which is the better approach in custom pages ?

  - by Mina Samy

  Hi all I want to create a custom new item page for sharepoint but there are two approached that I can use and I want to share your experience in determining which is better. The first: is to create a page in a library then create a C# library project to handle the events of the controls on the page. The second: is to define a feature of the content type of my list and specify the new item form to be my custom form, then create a website containing the custom form and put this site at the layouts folder. for me the first approach is fine but the problem is that a user may access the default sharepoint new item form which I don't want to happen. but I don't like the idea of placing the form in a library on the site. so which is better in your opinion ? thanks

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• Render a user control ascx

  - by Jeremy

  I want to use an ascx as a template, and render it programatically, using the resulting html as the return value of an ajax method. Page pageHolder = new Page(); MyUserControl ctlRender = (MyUserControl)pageHolder.LoadControl(typeof(MyUserControl),null); pageHolder.Controls.Add(ctlRender); System.IO.StringWriter swOutput = new System.IO.StringWriter(); HttpContext.Current.Server.Execute(pageHolder, swOutput, false); return swOutput.ToString(); This all executes, and the Page Load event of the user control fires, but the StringWriter is always empty. I've seen similar code to this in other examples, what am I missing?

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• backgroundDisabledColor error when upgrading from Flex3 to FlashBuilder 4

  - by DShultz

  I've upgraded a FlexBuilder3 project to FlashBuilder4, and I am seeing many compilation errors regarding unsupported tag attributes: The style 'backgroundDisabledColor' is only supported by type 'mx.controls.TextInput' with the theme(s) 'halo' Here is the offending mxml element: <mx:TextInput x="245" y="86" id="code1" maxChars="15" change="enableButton(event)" cornerRadius="9" borderStyle="solid" backgroundDisabledColor="#7977b6" /> ...what is the best workaround for this particular error? I was able to easily resolve a similar error with the "backgroundColor" attribute by changing it to "contentBackgroundColor", and was hoping there was a simple workaround for backgroundDisabledColor as well. I realize I can apply a css style, but I'd rather have a simpler solution as there are many many other attribute errors similar to this one.

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• Question about WinForms TrackBar control in .Net

  - by Jules

  Does anyone know the millisecond interval, used by the framework trackbar, between calling the ValueChanged event when moving the grip with a mouse? I've implemented my own trackbar and I'd like the behaviour to be consistent with what the user expects. I've had a look in reflector but it's one of those controls where most of the implementation is not viewable. ETA: Actually, thinking about it, it's not as simple as that. For small changes, the TrackBar is raising the event for every change. However, if you make a large fast change with the grip, it will not raise the event for every step. Just wondering exactly how the framework does this? Thanks

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• space around div with background image

  - by samoyed

  Hi to all, i'm trying to create a frame that will contain a dynamic amount of text. it has rounded corners so a created 3 divs:top, body and bottom. body will hold the content while top & bottom only display the respective images of the frame. all this can be seen here: http://www.m-challenge.com/nimrod/modular_frame.php the problem: there is a space those top and bottom divs and the middle one. please take a look and any input would be highly appreciated. have a nice day :-)

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• How to access drop down list from EditItemTemplate of FormView

  - by IrfanRaza

  Hello friends, I have a formview on my aspx page containing various controls arranged using table. There is a DDL "cboClients" which i need to enable or disabled depending upon role within Edit mode. The problem here is that i am not able to get that control using FindControl() method. I have tried following code - DropDownList ddl = null; if (FormView1.Row != null) { ddl = (DropDownList)FormView1.Row.FindControl("cboClients"); ddl.Enabled=false; } Even I ave used the DataBound event of the same control - protected void cboClients_DataBound(object sender, EventArgs e) { if (FormView1.CurrentMode == FormViewMode.Edit) { if ((Session["RoleName"].ToString().Equals("Clients")) || (Session["RoleName"].ToString().Equals("Suppliers"))) { DropDownList ddl = (DropDownList)sender; ddl.Enabled = false; } } } But this databound event occurs only once, but not when formview mode is changed. Can anyone provide me proper solution? Thanks for sharing your time.

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• UITableView: moving a row into an empty section

  - by Frank C

  I have a UITableView with some empty sections. I'd like the user to be able to move a row into them using the standard edit mode controls. The only way I can do it so far is to have a dummy row in my "empty" sections and try to hide it by using tableView:heightForRowAtIndexPath: to give the dummy row a height of zero. This seems to leave it as a 1-pixel row. I can probably hide this by making a special type of cell that's just filled with [UIColor groupTableViewBackgroundColor], but is there a better way? This is all in the grouped mode of UITableView UPDATE: Looks like moving rows into empty sections IS possible without any tricks, but the "sensitivity" is bad enough that you DO need tricks in order to make it usable for general users (who won't be patient enough to slowly hover the row around the empty section until things click)

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• Asynchronous Silverlight WCF callback

  - by Matt

  I've created my own WCF service and I've successfully been able to talk to it via my Silverlight client. I ran into an interesting problem on my asynchronous callbacks though. When my callback is invoked, I can't update any UI controls with the dreaded invalid cross thread access Here's what my callback function looks like private void GetTimeCallBack( object sender, Talk.ClientBase<IService>.ClientEventArgs e ) { lblDisplay.Text = e.Object.ToString(); } A quick google search showed me that I have to do this instead. private void GetTimeCallBack( object sender, Talk.ClientBase<IService>.ClientEventArgs e ) { Dispatcher.BeginInvoke( () => lblDisplay.Text = e.Object.ToString() ); } Now everything works fine, but I wasn't expecting my callback to be running on a different thread. Will I always have to use the Dispatcher class in order to modify anything within my class or is this just limited to UI elements? I've not familiar with the Dispatcher class at all so I'm looking to understand it more.

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• How to access a flash object embedded via swfobject's embedSWF?

  - by Andree

  Hi there, I have to call an ActionScript method via Javascript, but I have a problem accessing the flash object itself. I embed the flash file via the help of swfobject. Previously, when I use the static publishing approach, I could easily get the flash object by calling these methods: swfobject.registerObject("flash_object", "9", "expressInstall.swf"); var flash_object = swfobject.getObjectById("flash_object"); For some technical reasons, now I have to use the dynamic publishing approach (using swfobject.embedSWF). But, as mentioned in the documentation, the method getObjectById can only be used if you use static publishing approach. Now, how can I access the flash object? Cheers, Andree

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• JDBC connections: How to specify the port for data-transfer?

  - by LeO

  I wanto to run my JDBC-connection (either Oracle or MSSQL) through a proxy-server. Reason for this is to have additional controls of the traffic, especially for developing. I know, I could specify the proxy, which runs on my machine, and the port in the connection-string. But the specified connection-settings are only taken as some kind of handshake to agree on which port the data is finally transferred. And this is defenitly not the port which I have under proxy-control. So, does anybody have an idea, how to specify the port for the data-transfer? I would prefer if this could be done in the connection-string. The same issue applies for Oracle and MSSQL. Thx LeO

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• Does JSON.js cause conflicts with Sys.Serialization.JavaScriptSerializer.serialize

  - by David Robbins

  I am using Telerik controls in my webforms and want to serialize object on the client. Since I am getting a stackoverflow error with Sys.Serialization.JavaScriptSerializer.deserialize I wanted to try JSON. With both JSON and and the MS library I get "Sys.Application is undefined." Has anyone encountered this what did you do as a work around? EDIT I am serializing my object on a parent page and passing them via an argument to a child window. The child window is in an IFRAME tag. The object can be used in the child page, but I receive the stackoverflow error when I serialize it. The object is an Array of objects.

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• Rewriting VB.NET Lambda experession as a C# statement

  - by ChadD

  I downgraded my app from version 4 of the framework to version 4 and now I want to implement this VB.NET lambda function statement (which works on 3.5) Dim colLambda As ColumnItemValueAccessor = Function(rowItem As Object) General_ItemValueAccessor(rowItem, colName) and rewrite it in C#. This was my attempt: ColumnItemValueAccessor colLambda = (object rowItem) => General_ItemValueAccessor(rowItem, colName); When I did this, I get the following error: Error 14 One or more types required to compile a dynamic expression cannot be found. Are you missing references to Microsoft.CSharp.dll and System.Core.dll? C:\Source\DotNet\SqlSmoke\SqlSmoke\UserControls\ScriptUserControl.cs 84 73 SqlSmoke However, when I downgraded the app from version 4.0 of the framework to 3.5 (because our users only hae 3.5 and don't have rights to install 4.0). when I did this, the reference to "Microsoft.CSharp" was broken. Can I rewrite the VB.NET command in C# using syntax that is valid in C# 3.5 as I was able to in VB.NET? What would the syntax be?

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• ASP.net scriptmanager and AJAX control

  - by c11ada

  hey all, im making a username availability check in ASP.net using ajax updatepanel, but i keep getting the following error The control with ID 'UserNameUP' requires a ScriptManager on the page. The ScriptManager must appear before any controls that need it.] im using the create user wizard, to create a new user but i want to check if the user already exists, i have the following code in the aspx file <asp:UpdatePanel runat="server" ID="UserNameUP"> <ContentTemplate> <asp:TextBox ID="UserName" runat="server" Width="200px" AutoPostBack="true" OnTextChanged="Username_Changed"></asp:TextBox></ContentTemplate> </asp:UpdatePanel><br /> but i keep getting that error, can any one help thanks

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• Has there been a Firefox update recently?

  - by Rob Nicholson

  Trying again to ask a PROGRAMMING question because of the over-zealous closing off of what is equally a programming question before allowing the poster to clarify. The latest version of Firefox (v3.6.3) is breaking websites, mine included. I make heavy use of the Infragistic NetAdvantage controls. These, because of their heavy JavaScript reliance and occasional lack of quality control, tend to suffer through browser updates sometimes requiring a hotfix. So the question is... has there been a Firefox release recently that has either introduced a bug, tightening up of some standard, bug fix which might have broken a previous workaround (often the case) etc? I'm guessing around JavaScript but that's a guess hence the reason for asking a group of programmers...

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