Use the following code.(Not in the Login page.Put it in the pevious page)
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
string sb ;
sb = "<script language=javascript>\n";
sb += "window.history.forward(1);\n";
sb += "\n</script>";
Page.RegisterClientScriptBlock("clientScript",sb);
}
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