Hello,

I am having what I believe should be a fairly simple problem, but for the life of me I cannot see my problem. The problem is related to ScriptManager.RegisterStartupScript, something I have used many times before.

The scenario I have is that I have a custom web control that has been inserted into a page. The control (and one or two others) are nested inside an UpdatePanel. They are inserted onto the page onto a PlaceHolder:

<asp:UpdatePanel ID="pnlAjax" runat="server">
  <ContentTemplate>
    <asp:PlaceHolder ID="placeholder" runat="server">
    </asp:PlaceHolder>
    ...

protected override void OnInit(EventArgs e){
  placeholder.Controls.Add(Factory.CreateControl());
  base.OnInit(e);
}

This is the only update panel on the page.

The control requires some initial javascript be run for it to work correctly. The control calls:

ScriptManager.RegisterStartupScript(this, GetType(), 
                                    Guid.NewGuid().ToString(), script, true);

and I have also tried:

ScriptManager.RegisterStartupScript(Page, Page.GetType(), 
                                    Guid.NewGuid().ToString(), script, true);

The problem is that the script runs correctly when the page is first displayed, but does not re-run after a partial postback. I have tried the following:

1. Calling RegisterStartupScript from CreateChildControls
2. Calling RegisterStartupScript from OnLoad / OnPreRender
3. Using different combinations of parameters for the first two parameters (in the example above the Control is Page and Type is GetType(), but I have tried using the control itself, etc).
4. I have tried using persistent and new ids (not that I believe this should have a major impact either way).
5. I have used a few breakpoints and so have verified that the Register line is being called correctly.

The only thing I have not tried is using the UpdatePanel itself as the Control and Type, as I do not believe the control should be aware of the update panel (and in any case there does not seem to be a good way of getting the update panel?).

Can anyone see what I might be doing wrong in the above?

Thanks :)