ASP.NET dynamically reassign controls in the control tree

Posted by pbz on Stack Overflow See other posts from Stack Overflow or by pbz
Published on 2009-06-02T04:16:13Z Indexed on 2010/04/11 11:03 UTC
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Let's say I have a custom control that looks like this

<cc:MyControl runat="server" ID="myc" LinkControlID="NewParent" />

and, on the same page:

<asp:TextBox runat="server" ID="NewParent" />

What I would like to do is, from MyControl, change NewParent's parent so that it would be part of MyControl's Controls collection. When I try to do this, from OnInit, I get:

The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.

Which makes sense, but is there a way around this? I'm OK if NewParent remains the child of the Page as long as from MyControl I can somehow redirect the rendering to MyControl's control.

Can this be done? Thanks.

EDIT:

To clarify here's a mockup of MyControl:

public class MyControl : Panel
{
  protected override void OnInit(System.EventArgs e)
  {
	base.OnInit(e);
	if (!String.IsNullOrEmpty(LinkControlID))
	{
	  Control link = Parent.FindControl(LinkControlID);
	  if (link != null)
	  {
		Controls.Add(link);
	  }
	}
  }
  public string LinkControlID { get; set; }
}

This assumes that MyControl and LinkControlID are placed on the same level in the tree hierarchy, which is OK in my case.

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