index.aspx page
<asp:Button ID="btnShowPopupEmail" runat="server" Style="display: none" />
<ajaxToolkit:ModalPopupExtender ID="ModalPopupExtenderEmail" BackgroundCssClass="ModalPopupBG"
runat="server" TargetControlID="btnShowPopupEmail"
PopupControlID="PanelEmail" Drag="false" PopupDragHandleControlID="PopupHeader">
</ajaxToolkit:ModalPopupExtender>
<div id="PanelEmail" style="display: none;" class="popupConfirmation">
<div class="popup_Container">
<div class="popup_Titlebar" id="PopupHeaderEmail">
<table width="100%">
<tr>
<td>
<div class="TitlebarLeft">
<asp:Label ID="lblWarning" Text="Download Sample Report" runat="server"& ...
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