private void btnCTPhieuXuat_Click(object sender, EventArgs e)
{
frmCTPhieuXuat frm = new frmCTPhieuXuat();
frm.Show();
}
private void chiTiếtPhiếuXuấtToolStripMenuItem_Click_1(object sender, EventArgs e)
{
frmCTPhieuXuat frm = new frmCTPhieuXuat();
frm.ShowDialog();
}