dr.GetString(dr.GetOrdinal(""))问题


  private void frmmain_Load(object sender, EventArgs e)
        {
          
            string logintime;
            string connstring = "Data Source=PC-20120129PSKS\\SQLEXPRESS;Initial Catalog=studens;Integrated Security=True";
            SqlConnection conn1 = new SqlConnection(connstring);
            conn1.Open();
            logintime=DateTime.Now.ToLongTimeString();
            SqlCommand cmd = new SqlCommand("select Username ," + "Types from stu_user" ,conn1);
            SqlDataReader dr = cmd.ExecuteReader();
            dr.Read();
            label8.Text = dr.GetString(dr.GetOrdinal("Username"));
          
           if (dr.GetString(dr.GetOrdinal("Types")) == "超级用户")
            {
                button1.Enabled = false;
                button4.Enabled = false;
            }
          
        }
怎么IF语句判断不了啊，已经证明dr.GetString(dr.GetOrdinal("Types"))中读出数据了。