.NET Tutorials, Forums, Interview Questions And Answers
Welcome :Guest
Sign In
Win Surprise Gifts!!!

Top 5 Contributors of the Month
david stephan
Gaurav Pal
Post New Web Links

User clicking on dynamic controls ????

Posted By:      Posted Date: October 12, 2010    Points: 0   Category :Windows Application

With this code:

  private void Form1_MouseClick(object sender, MouseEventArgs e)


   Size imageSize = new Size(17, 17);

   if (e.Button == MouseButtons.Left)


    PictureBox spor = new PictureBox();

    spor.Image = sporType;

    spor.Size = imageSize;

    spor.Location = new Point(imageSize.Width * (e.Location.X / imageSize.Width), imageSize.Height * (e.Location.Y / imageSize.Height));




the user can insert controls - lots of different pictures in pictureboxe - on a form.

If the user clicks on one of them, I want to do some things with that particular picturebox - delete it or change the image.

How can I know WHEN and WITCH of them the user clicks on ?

Best regards KSor, Denmark

View Complete Post

More Related Resource Links

Using User Controls as Page Templates in Dynamic Data


Hi All,

Recently, I saw an article at:



However, when I turn on the Select and Update Commands for the gridview, I get the following behaviours:

- Select: Columns disappear, leaving the template column

- Update: Data was not updated to the database.


Please kindly assist.

Thank you in advance.


Warmest Regards,


Need help regarding C# / AJAX Dynamic Controls creation


radiobuttons is assigned before page init.. 

public partial class Default : System.Web.UI.Page
//Assign values as a specific Dynamic WebControl Creation.
List<RadioButton> radioButtons = new List<RadioButton>();
List<CheckBox> checkBoxes = new List<CheckBox>();

Then I created a class that would dynamically create a table containing the available flights depending on session.. (See CallPageLoad())

The placeholder and button is inside the UpdatePanel...

on the button inside the update panel, (btnSelect)

i have this code which works... 

protected void btnSelect_Click(object sender, EventArgs e)

Label1.Text = Convert.ToString(radioButtons.Count);

It detects the number of radiobuttons that were dynamically created...

But when I use the following code inside the BtnSelectClick event...

//PLS HELP.......
foreach (RadioButton button in radioButtons)
if (button.Checked == true)
Label1.Text = "You select... " + button;



It does not work even though t

UI Datepicker and web user controls



I have developed an application using the Master-Detail pattern described in this Matt Berseth article.

The only difference between Matt's article and me is that I am using a FormView object in place of a DetailsView.

Everything works fine except that the formview object, in my case it's inside a user control and I can't figure out how to use the jquery datepicker UI plugin.

I have tried to put the script block for the datepicker either in the aspx page as well as inside the user control but in both cases the calendar does not come up when the related textbox get the focus.

Any suggestion on how to work with the datepicker inside an ascx?

thanks in advance!

"Type ASP.x is not defined" error for dynamic user control when publishing updateable


I have a user control (ContainerCtrl) which programmatically instantiates another user control (SimpleCtrl) in OnLoad. It builds and runs fine, but when I publish it I get the error "error BC30002: Type 'ASP.SimpleCtrl' is not defined." (If I publish without the "updateable" option there's no error, but I need the site to be updateable.)

I assume this has to do with the particulars of how the assembly(ies) are built for the different compiler options. My question is, how can I get it to work properly for "updateable" publishing?

VS 2008 / .NET 3.5 sp1

The code follows (web.config is the default from Visual Studio).

Many thanks, Dave


<%@ Control Language="VB" ClassName="SimpleCtrl" CodeFile="SimpleCtrl.ascx.vb" Inherits="_SimpleCtrl" %>

    Simple control


Partial Class _SimpleCtrl
    Inherits UserControl

    'Nothing to see here.

End Class


<%@ Control Language="VB" CodeFile="ContainerCtrl.ascx.vb" Inherits="_ContainerCtrl"

Toolbox: User-Friendly UIs, Online Data Entry Controls, and More


Microsoft® Office is one of the most well-known and most-used consumer products. For many people, their only experience with a computer is when using Office, be it checking e-mail, creating presentations, or writing a document.

Scott Mitchell

MSDN Magazine February 2006

ASP.NET 2.0: Personalize Your Portal with User Controls and Custom Web Parts


ASP.NET 2.0 introduces a Web Part control that is designed to deal with the serialization, storage, and retrieval of customization and personalization data behind the scenes. In this article, the authors explain how you can put the WebPart control to work in your ASP.NET 2.0 applications.

Ted Pattison and Fritz Onion

MSDN Magazine September 2005

Advanced Basics: Adding New Features with User Controls


In past versions of Visual Basic, there were rudimentary graphics controls. In Visual Basic .NET you have the GDI+ library, which enables you to draw lines, circles, and most anything else. But how can you use the functionality of GDI+ to create lines and other graphics that respond to user mouse clicks and events? Find out.

Ken Spencer

MSDN Magazine June 2003

Windows Forms: Developing Compelling User Controls that Target Forms in the .NET Framework


In the beginning, writing controls meant dealing with Windows messages. Then came Visual Basic controls, which introduced methods, properties, and events. Later, ActiveX controls, which ran atop COM, became popular. While each innovation in control writing brought more flexibility, nothing has matched the versatility of the new .NET Windows Forms controls and Web Forms controls. This article, the first of a two-part series, introduces the reader to Windows Forms, beginning with their inheritance from one of the .NET CLR base classes, which makes control creation much faster than before. Control programming is illustrated through the development of a login control. The equally flexible Web Forms controls will be covered in Part 2.

David S. Platt

MSDN Magazine April 2002

Problem with Dynamic Controls



I have a custom user control that contains within it a repeater control. Inside this repeater I programmatically add another custom user control, which contains a text box and a custom validator. This final custom user control can be added any number of times depending on the application's logic. All of this is part of a wizard step.

When the user completes the step, if any of the data added to the text boxes is incorrect the validator gets fired on post back. However, because I can have any number of these controls added to the repeater, the user has to scroll down to see any of the incorrectly completed boxes.

Due to the controls being added dynamically it is not possible to use a validation summary control - I have tried!!! Therefore, is there away I can use JavaScript to position a cursor or to jump to each incorrectly completed textbox without the user needing to scroll down the page? For example, if there are 10 textboxes, and textboxes 8 and 9 have numbers inside them inside strings, then the JavaScript should jump textbox 9.

asynchronous loading user controls


I have 3 user controls that I have to load at the same time.  They each contain a gridview that pulls data from the database.  They are doing a "delay" load of the data so there is a progress bar template that shows that the data is loading however the first gridview fires and loads, then the second, then the third and I need them to all fire at the same time.  Any ideas? 

User Controls and Control Extenders


Two separate questions, but sufficiently intertwined that I'm going to try the two together....

Firstly - User Controls and Behaviours

I have a User Control which contains a few visual controls.  I am attaching some behaviours by using GetScriptDescriptors and am passing some JavaScript to the browser using GetScriptReferences.  That is all rock solid and working well.  However, when developing, I did discover that I couldn't attach the behaviours to the User Control itself - not surprising as rendering a User Control does not create a DOM element which represents the actual control.  So, I have attached my behaviours to a "random" TextBox within the User Control. 

So - first question, is there a better way to do that?  For example, should I always be rendering a SPAN as an element to surround the control?  Not sure what that would do to the robustness of the rendering.  What is the right way to attach a behaviour to a User Control.

Secondly - Accessing those same Behaviours later

Assume I have placed a User Control on the page.  That User Control exposes a Property (actually a Javascript Function of course) which does "something" to the control - for the sake of example we'll say that the function is set_Border(colour). 

How to dynamically create user controls ?



can you explain how to create user control dynamically in a web form ?When i am creating server controls of user controls are not instantiated and it is not getting initialized .when i am tyying to initialize its properties error occurs tha object instance not created .

Any suggestion ? 

dynamic creating controls in webpart


Hello everybody,


My webpart (wss 3.0, VS2005) initialy contain a listbox. Depeding on the selection made a certain amount of textboxes are to be created and rendered. Via these dynamically created / rendered textboxes text can be submitted (via a button), for futher processing.


I am not sure how, or where in the webpart code, to dynamically create these textboxes.


Maybe somebody can give me some advise on this topic.


Thanks in advance









How to add user controls into toolbox?

Hello, I have created a user control with ComboBox  & TreeView together. I want to use this control as a component so that I can drag and drop this control to other windows form! So what are the steps to get user control into toolbox? THANKS!

How to pass param between two user controls?

Hello,I would like to convert some aspx code in user controls. This would lead me to having a master user control that contains other controls inside.The contained user controls have datasource with some control parameters that takes the value from a control present in the aspx (now) and that will then moved in the container user control.which is the best way to handle a scenario like this?thanks a lot

Tab Container, Tab panels with User Controls - bug?

Hello all, I have a aspx page with a tab container, and 5 tabs on it - 4 of which hold user controls on them. I have a strange issue that presents sometimes, and I am not sure just what is causing it. Here is the scenario : there is one user control on each tab. On each of those user controls, there are a number of radio buttons in Update Panels. If a user selects one of the tabs, then selects another tab and clicks on one of the radio buttons on that tab causing a postback, when the page refreshes, the content of the previous tab becomes visible at the top of the current tab, pushing the original content down below it - as if the content of the previous tab has been appended to the top of the current tab's content. Has anyone out there experienced anything like this? What I did to "fix" the issue was simply to go into the aspx code for the tab container, and change the order of the tab panels in the code, something like this :  <cc1:TabContainer ID="tabContainer" runat="server"> <cc1:TabPanel ID="tabFirstTab" runat="server" HeaderText="My first tab" > <ContentTemplate> <uc1:usercontrol1 ID="UC1" runat="server" /> </ContentTemplate> </cc1:TabPanel>

add any number of dynamic controls on press of button

how can i add new control like image on every click of a button. the number of controls added should be number of times i pressed that button
ASP.NetWindows Application  .NET Framework  C#  VB.Net  ADO.Net  
Sql Server  SharePoint  Silverlight  Others  All   

Hall of Fame    Twitter   Terms of Service    Privacy Policy    Contact Us    Archives   Tell A Friend