高效填充datatable

 using (SqlConnection sqlCon=new SqlConnection (ConStr))
            {
               
                SqlDataAdapter sda = new SqlDataAdapter("SELECT * FROM tb2 t",sqlCon);
               // DataSet ds = new DataSet();
                DataTable dt = new DataTable();
            
                //ds.EnforceConstraints = false;
                dt.BeginLoadData();
                sda.Fill(dt);
                dt.EndLoadData();
                DataTableReader DtReader= dt.CreateDataReader();
                DataTable dt2 = new DataTable();
                dt2.Load(DtReader);
                MessageBox.Show(DtReader.HasRows.ToString ());
                this.dataGridView1.DataSource = DtReader;
            }