Question

Dynamically added usercontrol - button click event

Asked by: centdevs

I am dynamically loading a usercontrol into a panel.  The usercontrol contains a few textboxes and a button - that runs a linq query to insert data in a database.  I set a breakpoint on the first line of the button click event and run the code.  When I click the button, the user control disappears and the breakpoint is never hit.  What am I doing wrong?

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Asked On
2009-03-06 at 14:41:11ID24207515
Topic

C# Programming Language

Participating Experts
1
Points
500
Comments
4

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Answers

 

by: siancellPosted on 2009-03-06 at 18:51:48ID: 23822907

You have to re-add the control again at page_load. Can you specify some of your code?

 

by: centdevsPosted on 2009-03-07 at 06:02:39ID: 23824906

This code is scaled down a bit but the important points are there:

aspx.cs
 
PlaceHolder plcInteract = (PlaceHolder)RadMultiPage1.FindPageViewByID("RadPageView4").FindControl("plcInteract");
string userControl = dt.Rows[0]["PTAB_Desc"].ToString();
if (userControl != "")
{
    if (plcInteract != null)
    {
        
        foreach (string s in magUserControls)
        {
            Control ctrl = LoadControl(s);
            if (magProd)
            {
                PropertyInfo prop = ctrl.GetType().GetProperty("ProductID");
                prop.SetValue(ctrl, prodID, null);
            }
            plcInteract.Controls.Add(ctrl);
            ctrl.Visible = false;
            if (userControl == s)
                ctrl.Visible = true;
        }                                                
    }
}
 
ascx.cs
protected void btnSubmit_Click(object sender, EventArgs e)
{
    lblContent = "test";
}
 
ascx
<asp:Button ID="btnSubmit" runat="server" Text="Add This Address" 
CausesValidation="false" onclick="btnSubmit_Click"/>
"lblContent" runat="server">

                                              
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by: siancellPosted on 2009-03-09 at 07:25:18ID: 23836223

I see how you are loading the control, but I do not see where you are loading the control. What is happening is that you are loading the control via a button click or on page load, but since you do not handle viewstate in the control, then you would have to re-add the control on page load again. So in order to do this you would have to store how many controls you have dynamically added to the page in the Viewstate collection then, at page load after a post back (button click) check if (Page.IsPostback) then iterate through the Viewstate collection variable you stored how many controls where added, and add them to the page again the same way you are doing here, basically you'll have the code you used for adding the controls in two different places (1. the place in which you add the controls originally, 2. Page load after a post back). This is the simplest way of solving your problem.

In the technical side, use this forum thread in order to give you some direction.
http://forums.asp.net/p/1142608/1841813.aspx

20120131-EE-VQP-002

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