private void btnDatPhong_ItemClick(object sender, ItemClickEventArgs e)
{
Form frm = KiemTraTonTai(typeof(frmBook));
if (frm != null)
{
frm.Activate();
}
else
{
frmBook f = new frmBook();
IsMdiContainer = true;
f.MdiParent = this;
f.Show();
}
}
private void đặtPhòngToolStripMenuItem_Click(object sender, EventArgs e)
{
frmBook frmBook = new frmBook();
frmBook.ShowDialog();
}