Programatically added user control's IsPostback property

Hello all,

We are programatically loading user controls at run time using a place holder control.  The IsPostback property of these programatically loaded user controls are always true in the UC's Page_Load, Page_PreRender and Init events. In this case I need to populate a drop down list on the UC,  but I only want to do this once when it's initially loaded.  Is there a way to detect an initial load for a dynamically added user control?
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Assuming A.aspx loads user control B through a placeholder:

In A.aspx:

protected override bool OnBubbleEvent(object source, EventArgs args)
      B B1 = source as B;

      if (B1 != null)
            // do what ever yo want
            return true; // to stop further bubbling of event
      return base.OnBubbleEvent (source, args);

In B.aspx.cs - the user control:

private void Page_Load(object sender, System.EventArgs e)
      if (!IsPostBack)
            RaiseBubbleEvent(this, e);

...That just might do it : )
In B.aspx.cs - the user control

should be

In B.ascx.cs - the user control

...Although now that I re-read the Q, I'm not entirely convinced I anwered it... : p
I think the best way to solve your problem is to cache the values of your dropdownlist.

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

'Check if DropDownList cache is empty
If  HttpContext.Current.Cache("DropDownList") Is Nothing then
           'if empty then populate the cache with the datasource for the DDL. Could be arraylist, dataset, etc.
            HttpContext.Current.Cache.Insert("DropDownList") = Get_DDL_Datasource()
end If
            'now just populate the DDL with the cached datasource object
            ddl.datasource = HttpContext.Current.Cache("DropDownList")

    End Sub

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