How to set user status “0” when automatically logout inactive user?

public void ValidateUser_LOGSTS_Update(object sender, EventArgs e)
    {
        int userId = 0;

        string Cur_user = Session["Userid"].ToString();
        String constr = ConfigurationManager.ConnectionStrings["abcd"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand("sp_tbl_LogCheck_update"))
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@userID", Cur_user);
                cmd.Parameters.Add("@msg", SqlDbType.Int, 20).Direction = ParameterDirection.Output;
                cmd.Connection = con;
                con.Open();
                cmd.ExecuteNonQuery();

                // read output value from @NewId
                string msg_sts = Convert.ToString(cmd.Parameters["@msg"].Value);

                con.Close();
                if (msg_sts == "0")
                {
                    Session.Clear();
                    Session.Abandon();
                    //Response.Redirect(FormsAuthentication.LoginUrl);
                    FormsAuthentication.RedirectToLoginPage();
                }


            }

        }

    }

<pre><script type="text/javascript">

    var t;
    window.onload=resetTimer;
    document.onkeypress=resetTimer;

    function logout()
    {
	    alert("You are now logged out.")
	    location.href = 'LogOut.aspx'
    }
    function resetTimer()
    {
	    clearTimeout(t);
	    t=setTimeout(logout,60000) //logs out in 10 min
    }

    </script>