我想讀取某個表中的所有字段下面這個方法對嗎要是錯了應(yīng)該怎么改??！ public string  QeryList()        {            string str = 0;            string qery = "SELECT Name ,Nums ,UnitPrice from orderList ";            SqlDataReader reader = DBHelper.GetReadData(qery);            if (reader.HasRows)            { reader.Read();                 str += "\n 物品名：" + reader["Name"].ToString();                 str += "\n 數(shù)量："+reader["Nums"].ToString();                 str += "\n 數(shù)量："+reader["UnitPrice"].ToString();  }            return str;        }我調(diào)用這個方法在lable上顯示lable.text=o.QeryList();