private void laporanBukuToolStripMenuItem_Click(object sender, EventArgs e)
{
if (buku == null)
{
buku = new L_buku();
buku.MdiParent = this;
buku.FormClosed += new FormClosedEventHandler(L_buku_Closed);
buku.Show();
}
else
{
buku.Activate();
}
}
void L_buku_Closed(object sender, FormClosedEventArgs e)
{
buku = null;
}
