Please help me with loading my usercontrol into a PlaceHolder

[BlueBlade]

Hi, using VB.NET, I am trying to load a UserControl into a PlaceHolder dynamically. In the WebForm I added the following directive:

<%@ Reference Control="../UserControls/SquareRoot.ascx"%>

In PageLoad I have this piece of code:

Dim uc As SquareRoot
Page.LoadControl("../UserControls/SquareRoot.ascx")
PlaceHolder1.Controls.Add(uc)

Here is my error message:

System.ArgumentNullException: Value cannot be null. Parameter name: child


Ultimately I want to load the control when my user click on a button but I thought I would try it in the PageLoad routine first.

Please help,

 

[jmeckley]

you must assign [tt]child[/tt] a value. Your posted code doesn't use the parameter [tt]child[/tt] so we can't help without more code.

also, since your loading the user control in the code behind you shouldn't need to reference it in the aspx.

Jason Meckley
Programmer
Specialty Bakers, Inc.

 

[ninjadeathmonkey]

Well, I'm not sure. Here is an example of one I'm currently using. I put this in the OnInit():

[blue]override protected void[/blue] OnInit(EventArgs e)
{
   InitializeComponent();
   [blue]base[/blue].OnInit(e);
   placeHolder.Controls.Clear();
   [blue]string[/blue] control = [red]"~/controls/UserInfo.ascx"[/red];
   placeHolder.Controls.Add(Page.LoadControl(control));
}

You shouldn't have to reference it on the .aspx page either. Also, make sure the path to the user control is correct ;-). Though I'm pretty sure you can, I'm not positive that you can use "../etc" in the value for the path.

Let me know if that helps at all.

Ron Wheeler

http://www.tekdev.com/