public Dictionary <string, string> Authenticate(string userName, string password)
        {
            try
            {
                DataTable authenticationData = db.Authenticate(userName, password);

                Dictionary <string, string> userAuthDetails = new Dictionary <string, string>();
                if (authenticationData.Rows.Count > 1)
                {
                    MessageBox.Show("Authentication error two or more users have the same email!");
                    return(null);
                }
                else
                {
                    userAuthDetails["id"]       = authenticationData.Rows[0]["AuthenticationID"].ToString();
                    userAuthDetails["userType"] = authenticationData.Rows[0]["UserType"].ToString();
                    return(userAuthDetails);
                }
            }
            catch (Exception e)
            {
                MessageBox.Show("AuthenticationBusinessLogic : getUserTypeAndID ERROR:" + e.Message);
                throw;
            }
        }