//textbox的添加
for (int m = 0; m < al.Count; m++)
            {

                for (int n = 2; n < 5; n++)
                {
                    TextBox tb = new TextBox();
                    tb.Text = GridView1.Rows[(int)al[m]].Cells[n].Text;
                    GridView1.Rows[(int)al[m]].Cells[n].Controls.Add(tb);
                }
            }