public string ChangePwd(string UserCode, string NewPwd)
        {
            var Result = LoginDataAccess.ChangePwd(UserCode, NewPwd);

            if (Result == "0")
            {
                return("您输入的用户名不存在");
            }
            else if (Result == "1")
            {
                return("OK");
            }
            else
            {
                return(Result);
            }
        }