c#获取数据库中的某行某列的数据

c#将数据库中的某行某列的数据显示在textBox.text

            string sqlcon = "server=(local);User Id=sa;Pwd=;DataBase=printGY";
            SqlConnection con = new SqlConnection(sqlcon);
            string sqlStr = "select * from fkjhb";
            con.Open();
            SqlDataAdapter adapter = new SqlDataAdapter(sqlStr, con);
            DataSet ds = new DataSet();
            adapter.Fill(ds,"fkjhb");            
            textBox1.Text = ds.Tables["fkjhb"].Rows[0]["公司名称"].ToString(); //rows后面的是第几行第几列的数据.