private void btn_HoaDon_Click(object sender, EventArgs e)
{
FrmHoaDonBanSach hoadon = new FrmHoaDonBanSach();
this.Visible = false;
hoadon.ShowDialog();
this.Visible = true;
}
//Nghiệp vụ
private void lậpHóaĐơnToolStripMenuItem_Click(object sender, EventArgs e)
{
FrmHoaDonBanSach hoadon = new FrmHoaDonBanSach();
this.Visible = false;
hoadon.ShowDialog();
this.Visible = true;
}
private void toolStripBtnHoaDon_Click(object sender, EventArgs e)
{
FrmHoaDonBanSach hd = new FrmHoaDonBanSach();
this.Visible = false;
hd.ShowDialog();
this.Visible = true;
}