{
       EDPBLL = new EDPLogic();
       int id = EDPBLL.Add(Convert.ToInt32(Request.QueryString["EDP"]), Convert.ToInt32(Session["userId"]), DateTime.Now, Convert.ToInt32(ddlPrensa.SelectedValue));
       string numeroEDP = EDPBLL.generarNumeroEDP(id);
       EDPBLL.UpdateEdpCode(id, numeroEDP);
       Session["pEDPId"] = id;
       Session["numeroEDP"] = numeroEDP;

       int pTmp = 4;

       ScriptManager.RegisterStartupScript(Page, GetType(), "Popup", "<script>Popup('"+id+"','"+pTmp+"')</script>", false);
    }

<script type="text/javascript">
        function Popup() {
            $("#MainContent_btnPrueba", window.parent.document).trigger("click");
        }
    </script>