// Tách phiếu thu
 private void btnSplitBill_Click(object sender, EventArgs e)
 {
     try
     {
         frmTsk_SplitBill_Step1 afrmTsk_SplitBill_Step1 = new frmTsk_SplitBill_Step1(this, this.aNewPaymentEN);
         afrmTsk_SplitBill_Step1.ShowDialog();
     }
     catch (Exception ex)
     {
         MessageBox.Show("frmTsk_PaymentStep2.btnSplitBill_Click\n" + ex.ToString(), "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }
 public frmTsk_SplitBill_Step2(frmTsk_SplitBill_Step1 afrmTsk_SplitBill_Step1, NewPaymentEN aNewPaymentEN)
 {
     InitializeComponent();
     this.afrmTsk_SplitBill_Step1 = afrmTsk_SplitBill_Step1;
     this.aNewPaymentEN = aNewPaymentEN;
 }