Step 1 In the Page_Load event of your master page:
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
if (Session["LoginId"] == null)
Response.Redirect("frmLogin.aspx");
else
{
Response.ClearHeaders();
Response.AddHeader("Cache-Control", "no-cache, no-store,
max-age=0, must-revalidate");
Response.AddHeader("Pragma", "no-cache");
}
}
}
Step 2 Do clear the session on the Logout button as:
Session.Abandon();
Session.Clear();
Step 3
<script language="text/javascript">
function back()
{
windows.history.forward(1);
}
</script>
<body onload="back()">
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