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• Abstract base class for Winforms-Control and VS2008 Designer support?

  - by BeowulfOF

  Hi, I engadged a problem with inherited Controls in WinForms, and need some advice on it. I do use a base class for items in a List (selfmade GUI list made of a panel) and some inherited controls that are for each type of data that could be added to the list. There was no problem with it, but I know found out, that it would be right, to make the base-control an abstract class, since it has methods, that need to be implemented in all inherited controls, called from the code inside the base-control, but must not and can not be implemented in the base class. When I mark the base-control as abstract, the VS2008 Designer refuses to load the window. Is there any way to get the Designer work with the base-control made abstract?

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• Adding dynamic links using NavigateURL on ASP.NET (VB)

  - by AZIRAR

  Hello, I Have this code in my page, and I want that every NavigateUrl display another page like : simple.aspx?id=1, simple.aspx?id=2, ... Where id = c Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Dim c As Integer = 0 While c < 5 Dim Label1 As New Label() Dim ltr As New Literal() Dim link As New HyperLink() link.NavigateUrl = "simple.aspx" link.BackColor = Drawing.Color.Aqua Label1.Text = c.ToString() ltr.Text = "<br/>" PlaceHolder1.Controls.Add(Label1) PlaceHolder1.Controls.Add(link) PlaceHolder1.Controls.Add(ltr) c += 1 End While End Sub Thanks.

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• How do build a composite or template control in ASP.Net MVC, or the equivelant?

  - by Jason Jackson

  In our current ASP.Net Webforms application we have several composite/template server controls that only exist for a common look and feel. For example, we have a panel control that has a title, a place for buttons related to the contents of the panel, and of course the contents. How is this best accomplished in MVC? RenderPartial doesn't get done what I need here. Should I still be using the same controls, but just on a view page? These controls don't really do anything on postback, they are only there for a common look and feel.

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• C# - Layout problem on Windows XP professional

  - by Rakib Hasan

  I am developing a C# application with .NET Framework 2.0. The problem is, that on my client's PC, the controls get expanded, layout changes (positions of the controls gets changed), sometimes buttons get missed entirely. It happens even on Forms with 2-3 TextBoxes, 2-3 Buttons and some Labels. I tried a lot of investigations. I tried to show a message in the form's resize event. But it doesn't get called. After digging a bit more, it seemed that in Designer.cs file even though ResumeLayout (false) is being called for the form, but this causes the the expansion/disposition of the controls. My Client is using Windows XP professional on his Dell laptop. He is able to reproduce the issue on other laptops with Windows XP professional. But not in other OSes (like Windows XP Home or Windows Vista). In my desktop with Windows XP professional, it is not reproducible. How can this issue be resolved?

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• How to make a web browser with tabbed browsing with vb 2008?

  - by felixd68

  I've tried multiple times to create a web browser with tabbed browsing. I know that I have to use "tab control". I have succeeded in creating a semi-tabbed browsing. People are able to add new tabs, but the webbrowser component only appears in one tab page. Coding: Form1_Load: Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim Browse As New WebBrowser TabControl1.TabPages.Add(1, "TabPage" & i) TabControl1.SelectTab(1 - 1) Browse.Name = "wb" Browse.Dock = DockStyle.Fill TabControl1.SelectedTab.Controls.Add(Browse) i = i + 1 End Sub Web Browser Component Private Sub WebBrowser1_DocumentCompleted(ByVal sender As System.Object, ByVal e As System.Windows.Forms.WebBrowserDocumentCompletedEventArgs) url.Text = e.Url.ToString() 'your url text box will show the actual url of the page after the page is fully loaded url.Text = e.Url.ToString Me.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle & " - Webbrowser's name" TabControl1.SelectedTab.Text = CType(TabControl1.SelectedTab.Controls.Item(0), WebBrowser).DocumentTitle End Sub

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• failed to load viewstate. the control tree into which viewstate

  - by Mohan

  Hi Everybody, i have a gridview control . When I change page of gridview control i get this error. Server Error in '/' Application. Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request. how to tackle with this problem. It's urgent Any suggestion? Thanks in advance.

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• Add Event Handler To Dynamic Dropdownlist

  - by Andrea Girardi

  Hi all! I have a page that contains dynamically generated Dropdown List controls and I want thant the dynamic dropdown list perform an AutoPostback to fill some other field using the value selected. This is the code I'm using to create dynamically the control: If (Not IsPostBack) Then Dim newDDL As DropDownList = New DropDownList() AddHandler newDDL.SelectedIndexChanged, AddressOf ChangeValue newDDL.ID = "Level1" [fill the DropDownList] newDDL.Items.Insert(results.Count, New ListItem("", -1)) newDDL.Width = "300" newDDL.AutoPostBack = True newDDL.SelectedIndex = results.Count LevelDDLs.Controls.Add(newDDL) LevelDDLs.Controls.Add(New LiteralControl("<br /><br />")) End If Control is correctly filled and rendered on ASP page but, after selecting a value, the page is reloaded (AutoPostBack is called) but the control is not diplayed and the sub is not called. I put a breakpoint into the ChangeValue sub but anything happens. I read on some post that handler for the first DropDownList is not necessary but, how is it possible to tell DropDownList to call my sub after changevalue? Could you help me, please? many thanks, Andrea

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• Aero Glass Buttons Like Windows Media Player?

  - by Tanner

  Hi everybody, I am making making a program and I want to have a Aero Glass set of controls just like Windows Media Player, I found this: http://blogs.msdn.com/b/tims/archive/2006/04/18/578637.aspx but it just draws black. I also found a control that had the media player controls built in right ton the glass but it was no good it didn't want to render right and made different parts of my program not work. Any controls, or ways to extend the Aero glass so I can at least add my own buttons would be greatly appreciated. Thanks :) BTW C# only. :)

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• Embedded media player gets inconsistent currentPosition on both IE8 and Firefox3

  - by logoin

  I have a embedded media player in the browser that is controlled by javascript to handle all the mediaChange event. The code looks like mediaChangeHandler: function(media) { if (media && this.offset && !this.offsetJumpPerformed) { if (parseFloat(media.duration) > this.offset) { pos = parseInt(pos); this.getPlayer().controls.currentPosition = pos; alert("jump to position: " + this.getPlayer().controls.currentPosition); this.play(); this.offsetJumpPerformed = true; alert("currentPosition:" + this.getPlayer().controls.currentPosition); } } } The first alert indicates the currentPosition is where I want it to be. However, the second alert would get currentPosition that's couple seconds less than what I have set up. Does anyone have idea why? I tried googled it but haven't found anything useful. Thanks!

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• BlackBerry - video player - FramePositioningControl is null

  - by sinu-mathews

  I'm developing a blackberry application that plays video from the server. I've used Player.start() and Player.stop() for playing and pausing a video. But I also need rewind, forward and seek bar controls in my application. I tried using FramePositioningControl for these controls. But the following code is returning null. FramePositioningControl framePositioningControl = (FramePositioningControl) player.getControl("FramePositioningControl"); I searched several forums and they say many players do not support FramePositioningControl. What players support FramePositioningControl? And what else should I do to add these controls in my application?

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• How to show scrollbars in TScrollBox after it has been made visible again?

  - by aleluja

  Hi, I've ran into one small problem. I am dynamicaly generating some controls and place them on a TScrollbox component. But i noticed that if scrollbox is visible, user can clearly see each of the controls being created and placed. So it looksl ike lots of work is being done and it is slow. I hid the scrollbox and generated all the controls on it, which took much less time and no flickering and alike. But here's the problem. When i unhide the scrollbox, its' scrollbar doesn't appear untill i actually resize the form. (The alignment of scrollbox is alClient) Any ideas on how to fix this? Tried repainting, but it didn't work. Refresh didn't work either. Thank you

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• WPF Horizontal Scrollbar is not visible

  - by Ant

  Hi All,      I have a Grid inside ScrollViewer. Grid has only one columns and many rows. I add controls into grid rows. The problem is I can see VerticalScrollBar when I am adding controls but I cannot see HorizontalScrollBar although I add very wide controls. My xaml looks like the following <ScrollViewer> <Grid> rows ... </Grid> </ScrollViewer> Thanks, ant.

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• Binding dropdown list in a gridview edit item template

  - by Renju

  i can bind the dropdownlist in the edit item template. The drop down list is having null values. protected void grdDevelopment_RowDataBound(object sender, GridViewRowEventArgs e) { DropDownList drpBuildServers = new DropDownList(); if (grdDevelopment.EditIndex == e.Row.RowIndex) { drpBuildServers = (DropDownList)e.Row.Cells[0].FindControl("ddlBuildServers"); } } also getting an error Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.

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• Creating user control with dock.Full property giving me a problem

  - by Royson

  Hi, My application has several controls. Like in one screen has treeview on left side,gridview with paging in the middle and 4 buttons at right side. the controls are properly appears when the form is in maximize state. but if i minimize it the controls are not properly fits in the screen. i tried with different different tricks like table layout.. in dat i added panel...etc.. but i could not solve the problem. How can i create such type of screens which fits independent of size of my window. Thanks

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• Getting a scriptmanager into a dynamically rendered page

  - by AndreasKnudsen

  Hi, We are rendering usercontrols dynamically like this: public string RenderControl(string pathcontrol) { string html; var page = new Page(); var control = page.LoadControl(path); page.Controls.Add(control); // do stuff to the control (give it some data to work on) using (var writer = new StringWriter()) { HttpContext.Current.Server.Execute(page, writer, false); html = writer.ToString(); } return html; } This lets us the same user controls when rendering pages normally as we do when rendering responses to ajax calls. However, when adding controls which themselves contain a scriptmanagerProxy we run into the problem that the newed up Page object doesn't contain either a ScriptManager or the HtmlForm in which the ScriptManager needs to run. Is there any way around this? Yours Andreas

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• Get clientid in user control from external javascript file

  - by Giorgi

  Hello, I am developing a user control (ascx) in ASP.NET which uses javascript for manipulating controls. Currently the javascript code is inlined and uses <%= somecontrol.ClientID %> to get the control it needs. I want to put the javascript file in external file but from external file I cannot use the above syntax for retrieving controls. I have read about possible solutions in this and this answers but the problem is that the user control can be placed multiple times on page. This means that the Controls array (mentioned in the answers) will be rendered several times with different items. As a result the script will not be able to retrieve the id it needs. If I put <%= ClientId %> in the name of array that holds items then I will have the same problem as I am trying to solve. Any ideas?

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• HTML-5 : video tag. Video not playing

  - by Microkernel

  Hi guys, I was trying use/test video tag of HTML-5. Here is the code <!DOCTYPE HTML> <html> <body> <video src="./Pilot.avi" controls="controls"> your browser does not support the video tag </video> </body> </html> Pilot.avi is stored in the same same directory as this HTML page. The problem is, I am seeing the controls being displayed but can't play the video. I tried with, 1) Mozilla Firefox 3.6.13 2) Google Chrome 8.0.552.224 What could be the problem? Regards, Microkernel

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• How can I get VS2008 winforms designer to render a Form that implements an abstract base class

  - by BeowulfOF

  Hi, I engadged a problem with inherited Controls in WinForms, and need some advice on it. I do use a base class for items in a List (selfmade GUI list made of a panel) and some inherited controls that are for each type of data that could be added to the list. There was no problem with it, but I know found out, that it would be right, to make the base-control an abstract class, since it has methods, that need to be implemented in all inherited controls, called from the code inside the base-control, but must not and can not be implemented in the base class. When I mark the base-control as abstract, the VS2008 Designer refuses to load the window. Is there any way to get the Designer work with the base-control made abstract?

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• Is there any latest YAFForum OpenSource?

  - by user306905

  Hi, All I downloaded YAF-v1.9.4-RC1-BIN.zip version. but it is not working . and also added tagprefix in the web.config file. <add tagPrefix="YAF" namespace="YAF.Controls" assembly="YAF.Controls, Version=1.9.4.0" /> but still some errors occured. like sandbox related. <%@ Control Language="C#" AutoEventWireup="true" CodeFile="ShoutBox.ascx.cs" Inherits="YAF.Controls.ShoutBox" % Is there any conplete solution . please send me [email protected] .

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• How do I pre-empt IIS StaticFileHandler with my own HttpHandler

  - by Hmobius

  Hi there, I'm building a website referencing an assembly that contains several js scripts as embedded resources, some controls which use those scripts and a 'HttpResourcesHandler' that knows how to retrieve those embedded scripts when asked for them. In web.config I have an entry in the section that reads <add verb="*" path="/embedded/controlscripts/*" validate="false" type="CWeb.Controls.Web.HttpResourcesHandler, CWeb.Controls.EditBox" /> This control adn the website work absolutely fine when debugging with the Visual Studio web development server, but if I then switch the website to run under IIS (v7 - I'm running Vista and there appears to be no problem with debugging the site using IIS 5 or 6), the control can no longer access the scripts. I get a HTTP 404.0 error screen indicating the StaticFileHandler cannot find the file. I know that - it's embedded. So the StaticFileHandler appears to be grabbing the request for the script before my own and returning a 404. How do I tell IIS to use my own resource handler for the embedded/controlscripts directory rather than the staticfilehandler? I'm running the website in classic mode by the way.

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• Adding button in Actionscript code : Using Flex Builder

  - by dta

  I created a new actionscript project using Flex Builder 3 and tried to run the following file. I get this error : Definitions: fl.controls:Button could not be found. All I want to do is, to add a button to the application. How could I do it? package { import PaperBase; import org.papervision3d.objects.primitives.Cone; import fl.controls.Button; import fl.controls.Label; import fl.events.ComponentEvent; public class cone1 extends PaperBase { public var cone:Cone = new Cone(); protected var sceneWidth:Number; protected var sceneHeight:Number; public function cone1() { sceneWidth = stage.stageWidth sceneHeight = stage.stageHeight; init(sceneWidth*0.5,sceneHeight*0.5);//position of the cone } override protected function init3d():void { cone.scale = 5; cone.pitch(-40) default_scene.addChild(cone); } override protected function processFrame():void { cone.yaw(1);//rotation speed } } }

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• Form Design ScriptControlClass

  - by raghumithra

  I am working on a form designer. We have two parts: first is designing form by placing controls, and second is writing VB code in rich text editor. How do i integrate design and code (events of the controls) in runtime? I am using ScriptControlClass Form4 f4 = new Form4(); f4.Name = "dgfdfg"; f4.Text = "Raghudfgmithra"; Button btn = new Button(); btn.Text = "HI"; btn.Left = 25; btn.Top = 50; btn.Name = "btnSubmit"; f4.Controls.Add(btn); script.AddObject("form", f4, true); script.AddCode("???????????); script.ExecuteStatement(????????????);

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• Testing complex entities

  - by Carlos

  I've got a C# form, with various controls on it. The form controls an ongoing process, and there are many, many aspects that need to be right for the program to run correctly. Each part can be unit tested (for instance, loading some coefficients, drawing some diagnostics) but I often run into problems that are best described with an example: "If I click here, then here, then change this, then re-open the form, then click here, it crashes or produces an error" I've tried my best to use common code organisational ideas (inheritance, DRY, separation of concerns) but there never seems to be a way to test every single path, and inevitably, a form with several controls will have a huge number of ways to execute. What can I read (preferably online) that addresses this kind of issue, and is there a (non-generic) term for it. This isn't a specific problem I'm having, but one that creeps up on me, especially with WinForms.

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• Access a content control in C# when using Master Pages

  - by Guillaume Gervais

  Good day everyone, I am building a page in ASP.NET, and using Master Pages in the process. I have a Content Place Holder name "cphBody" in my Master Page, which will contain the body of each Page for which that Master Page is the Master Page. In the ASP.NET Web page, I have a Content tag (referencing "cphBody") which also contains some controls (buttons, Infragistics controls, etc.), and I want to access these controls in the CodeBehind file. However, I can't do that directly (this.myControl ...), since they are nested in the Content tag. I found a workaround with the FindControl method. ContentPlaceHolder contentPlaceHolder = (ContentPlaceHolder) Master.FindControl("cphBody"); ControlType myControl = (ControlType) contentPlaceHolder.FindControl("ControlName"); That works just fine. However, I am suspecting that it's not a very good design. Do you guys know a more elegant way to do so? Thank you! Guillaume Gervais.

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• Delphi: How to diagnose sluggish UI?

  - by Ian Boyd

  i have a form, which you can pretend is laid out like Windows Explorer: panel on the left splitter client panel +------------+#+-----------------------+ | |#| | | |#| | | |#| | | |#| | | Left |#| Client | | |#| | | |#| | | |#| | | |#| | | |#| | +------------+#+-----------------------+ ^ | +----splitter The the left and client area panels are each rich with controls. The problem is that using the splitter is very sluggish. i would expect that a modern 2 GHz computer can re-display the form as fast as a human can push the mouse around. But that's definitely not the case, and it takes about 200-300 ms before the form is fully re-adjusted. The form has about 100 visual controls on it, no code, or custom controls. How do i go about tracing who's the cause of the sluggishness?

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