csharp DataTable and DataGridView delete a Row

                    //DataTable 得到標題
                    //締友計算機技術有限公司 塗聚文
                    //foreach (DataColumn column in dt.Columns)
                    //{
                    //    selectDt.Columns.Add(column.ColumnName, column.DataType);
                    //}
                    //DataTable 移動行 delete或 Remove 可以移除，但會出現問題 塗聚文注 20120808
                    //foreach (System.Data.DataRow rowIndex in removeRowIndex)
                    //{
                    //    dt.Rows.Remove(rowIndex);
                    //} 
                    //foreach (DataGridViewRow item in this.dataGridView1.SelectedRows) 
                    //{ 
                    //    dataGridView1.Rows.RemoveAt(item.Index); 
                    //} 


                    //DataGridView指定移除行
                    List<DataGridViewRow> removeRowIndex = new List<DataGridViewRow>();
                    for (int i = 0; i < dataGridView1.Rows.Count; i++)
                    {
                        if (!list.Contains(dataGridView1.Rows[i].Cells[0].Value.ToString()))
                        {
                            removeRowIndex.Add(dataGridView1.Rows[i]);
                        }
                    }
                    //DataGridView選擇移除
                    //foreach (DataGridViewRow row in dataGridView1.SelectedRows)
                    //{
                    //    dataGridView1.Rows.Remove(row);
                    //}

                    foreach (DataGridViewRow dr in removeRowIndex)
                    {

                        dataGridView1.Rows.Remove(dr);

                    }