protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
string ma = GridView1.SelectedRow.Cells[0].Text;
dv = cn.GetDonViByID(ma);
if (dv != null)
{
txtMaDonVi.Text = dv.MaDonVi;
txtTenDonVi.Text = dv.TenDonVi;
txtDiaChi.Text = dv.DiaChi;
txtSoDienThoai.Text = dv.SoDienThoai;
txtWebsite.Text = dv.Website;
}
}