private void ghiNhậnĐặtChỗToolStripMenuItem_Click(object sender, EventArgs e)
 {
     LapPhieuDatCho f = new LapPhieuDatCho();
     f.Show();
 }
 private void btnlapphieu_Click(object sender, EventArgs e)
 {
     LapPhieuDatCho f = new LapPhieuDatCho();
     f.Show();
     f.FormClosed += new FormClosedEventHandler(Reload);
 }
 private void btnghinhandatve_Click(object sender, EventArgs e)
 {
     LapPhieuDatCho f = new LapPhieuDatCho();
     f.Show();
 }