dataGridView显示问题

  public static DataTable GetByDT(string sql)
        {
            //
            DataTable dt;
            DataSet ds=new DataSet();
            try
            {
                SqlDataAdapter sda = new SqlDataAdapter();
                sda.SelectCommand = new SqlCommand(sql, conn);
                sda.Fill(ds);
                dt = ds.Tables[0];
            }
            catch (DataException e)
            {
               
                throw e;
            }
            conn.Close();
            return dt;
        }

加载代码

 private void frmEdit_Search_Load(object sender, EventArgs e)
        {
           string sql = "select * from [NewsInfo]";
            DataTable dt = DBH.GetByDT(sql);
            this.dataGridView1.DataSource = dt;        
            //this.dataGridView1.DataBind();
            //dataGridView1.AutoGenerateColumns = false;
            //dataGridView1.Columns[0].DataPropertyName = "ID";
            //dataGridView1.Columns[1].DataPropertyName = "Caption";
            //dataGridView1.Columns[2].DataPropertyName = "GroupName";
            //dataGridView1.Columns[3].DataPropertyName = "CensorStatus";
            //dataGridView1.Columns[4].DataPropertyName = "PutTime";
           // MessageBox.Show(dt.Rows.Count.ToString());
        }