c#如何实现固定信息，自动判断录入

如何实现输入编号，如果有此编号的记录，就将此记录的其它字段赋值给相应的textbox中
我写了，但好像不对，不知道怎么改，希望高手帮忙
 if (e.KeyCode == Keys.Enter)
            {
                myclass.opendata();
                DataSet ds = new DataSet();
                SqlDataAdapter adp = new SqlDataAdapter();
                string sql = "select * from materialinfo where bh='" + bh.Text.Trim() + "'";
                adp. = sql;
                adp.Fill(ds);
           
                this.wzlb.Text = ds.Tables[0].Rows[0][1].ToString().Trim();
                this.clmc.Text = ds.Tables[0].Rows[0][2].ToString().Trim();
                this.xhgg.Text = ds.Tables[0].Rows[0][3].ToString().Trim();
                this.jldw.Text = ds.Tables[0].Rows[0][4].ToString().Trim();
            }