I have this using asp.net & it requires user to log in.The log out works and redirects to homepage but when back is clicked on browser its not working.I know i had to create a seperate...

protected void LinkButton3_Click(object sender, EventArgs e)
    {
        string connStr = ConfigurationManager.ConnectionStrings["MyConnection"].ConnectionString;
        SqlConnection con = new SqlConnection(connStr);
        con.Open();
        string dat =Convert.ToString( DateTime.Now.ToShortDateString());
        SqlCommand cmd = new SqlCommand("update LoginData set LogoutTime='" + dat+ "' where LogSession='" + sessionlog + "'", con);
        cmd.ExecuteNonQuery();
        con.Close();
        Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "Script", "alert(' You Are Now Logged Out....');", true);
        Response.Redirect("main.aspx");
     
     }