as I can close a dialog that is located in a master page by c # code from another page that is inside the dialog which is loaded by the content url

master page code snippet

<eo:Dialog runat="server" ID="dia_modal" BorderStyle="None" CloseButtonUrl="00070101"
ControlSkinID="None" Height="590px" Width="860px" ShadowColor="LightGray" BorderColor="#335C88"
RestoreButtonUrl="00070103" ShadowDepth="3" ResizeImageUrl="00020014" BackShadeColor="Blue"
IsModal="False" Font-Size="18pt" HeaderHtml="Parametros" BackColor="White" Font-Bold="True"
CancelButton="btn_cancelar" CssClass="CssPop" ClientSideOnCancel="Cancelar" ClientSideOnEnd="Cancelar"
ContentUrl=".../otros.aspx">
<ShowEffect Type="GlideLeftToRight" />
<CloseEffect Type="GlideTopRightToBottomLeft" />
<HeaderStyleActive CssText="background-color: #00A8EC;font-family:'Open Sans' , sans-serif;font-size:15pt;padding-bottom:3px;padding-left:4px;padding-right:4px;padding-top:3px;color: White" />
<ContentStyleActive CssText="border-top: #335c88 1px solid;"></ContentStyleActive>
<ContentTemplate>
</ContentTemplate>
</eo:Dialog>



on the other page after making a close the dialog disobey process by code

_InfoTblCompania = LlenarTablaAInsertar();
Logic_TblCompania.ActualizarGeneral(_InfoTblCompania, Convert.ToDecimal(txt_porcentaje.Text));
LlenarFormulario();
string script = @"<script type='text/javascript'>
window.parent.document.getElementById('ctl00_dia_modal').close(); </script>";
ScriptManager.RegisterStartupScript(this, typeof(Page), "cerrar", script, false);