C#在访问英文排序规则数据库的表的时候，显示的汉字是问号

[nettt]

写了一个小程序，
程序要访问一个表，该库是英文库，在插入数据库的时候都要加上N''

        private void btnSelect_Click(object sender, EventArgs e)
        {
            PAOS.BaseClass.DataCon datacon = new PAOS.BaseClass.DataCon();
            PAOS.BaseClass.DataOperate doperate = new PAOS.BaseClass.DataOperate();
            DataSet myds = datacon.getds("SELECT   employee AS SYSID,description5 as 工厂编号, code AS 工号, name AS 姓名, shname AS 短名, description1 AS 拼音名, username AS 英文, description2 AS 入职日期, description4 AS 离职日期, "
                  + " extcode as Extcode, fixshift AS 班次, fixjob AS 工种, dbuser AS 账号, dbpassword AS 登录密码, state AS 一卡通状态, readerpin AS UUCODE, active AS 状态 FROM   dbo.base_employees where code like '"+TxtCODE.Text.Trim()+"%'"+"", "base_employees");
            dgvPInfo.DataSource = myds.Tables["base_employees"];
        }

这是我在前台显示是用的代码，显示出来的name这一列都是问号

不知道怎么解决