I have created Table control dynamically added which has link button when clicked , panel control pops up.

I geeting an error:

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

-It point to the line "Form.controls.add(Panel)". Can somebody help please.

while (reader.Read())
{
TableRow r1 = new TableRow();
TableCell c1 = new TableCell();
TableCell c2 = new TableCell();
TableCell c3 = new TableCell();
c3.Width = Unit.Pixel(160);
LinkButton lnk = new LinkButton();
lnk.Text = "Click me to pop up";
Panel p = new Panel();
Form.Controls.Add(p); //Getting error in this line
p.Height = Unit.Pixel(80);
p.Width = Unit.Pixel(80);
p.BackColor = Color.CornflowerBlue;
AjaxControlToolkit.HoverMenuExtender h = new AjaxControlToolkit.HoverMenuExtender();
Form.Controls.Add(h);// Getting error in this line too
h.TargetControlID = lnk.UniqueID;
h.PopupControlID = p.UniqueID;
c3.Controls.Add(lnk);
c2.Text = reader["RowId"].ToString();
c1.Text = reader["MemPrediction"].ToString();
r1.Cells.Add(c2);
r1.Cells.Add(c1);
r1.Cells.Add(c3);
Tablevar1.Rows.Add(r1);
}

It looks like the error is not grumpy with this code, but with when you're running it. Have you tried performing this at an allowed point in the page life cycle?

I like to work programatically myself, and I can confirm that it's a bit grumpy around the edges.

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