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public override void VerifyRenderingInServerForm(Control control)
{
//base.VerifyRenderingInServerForm(control);
}
protected override void Render(HtmlTextWriter writer)
{
if (this.Request.QueryString["xxx"] != null && this.Request.QueryString["xxx"]=="1")
this.PlaceHolder1.RenderControl(writer);
else
base.Render(writer);
}