private void btnBC_Click(object sender, EventArgs e)
{
frmLapBaoCaoDoanhThu BC = new frmLapBaoCaoDoanhThu();
BC.ShowDialog();
}
private void LapBaoCaoThangToolStripMenuItem_Click(object sender, EventArgs e)
{
frmLapBaoCaoDoanhThu child = new frmLapBaoCaoDoanhThu();
child.MdiParent = this;
child.Show();
}
