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window.onbeforeunload = function()
{
document.getElementById("Button1").click();
}
<head runat="server">
<title></title>
<script language="javascript">
window.onunload = function()
{
document.getElementById("Button1").click();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</form>
</body>