protected void Page_Load(object sender, EventArgs e)
{
//create a new instance of the security object
clsSecurity Sec;
//get the data from the session
Sec = (clsSecurity)Session["Sec"];
//invoke the sign-out method
Sec.SignOut();
//update the copy in the session
Session["Sec"] = Sec;
//re-direct to the main page
Response.Redirect("Default.aspx");
}