public String LoginCheck(String username, String password)
        {
            Datalayer       dl = new Datalayer();
            MySqlDataReader dr = dl.LoginCheck(username, password);

            if (dr.Read())
            {
                Global.GlobalVar = dr["SSN"].ToString();

                if (dr["Type"].Equals("admin"))
                {
                    return("admin");
                }
                else
                {
                    return("emp");
                }
            }
            else
            {
                return(null);
            }
        }