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Window.Opener In Javascript
<form id="frmDefault" runat="server">
<asp:TextBox ID="txtName" runat="server"></asp:TextBox>
<asp:Button ID="btnTest" Text="Click" runat="Server" />
</form>
function TestOpener() {
window.open("OpenerPage.aspx");
}
<script type="text/javascript">
alert(window.opener.document.frmDefault.txtName.value);
</script>
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