private void btnSuaChuyenXe_Click(object sender, EventArgs e)
 {
     FormChuyenXe frm = new FormChuyenXe();
     frm.txtIDChuyenXe.Text = IDDangChon;
     frm.txtIDChuyenXe.Enabled = false;
     frm.Show();
 }
 private void button1_Click(object sender, EventArgs e)
 {
     FormChuyenXe frm = new FormChuyenXe();
     frm.txtIDChuyenXe.Text = MaChuyenXeTuTang();
     frm.Show();
 }