private void kasirToolStripMenuItem_Click(object sender, EventArgs e)
{
if (frmKasir == null)
{
frmKasir = new FormMasterKasir();
frmKasir.FormClosed += new FormClosedEventHandler(frmKasir_fromClosed);
frmKasir.ShowDialog();
}
else
{
frmKasir.Activate();
}
}
void frmKasir_fromClosed(object sender, FormClosedEventArgs e)
{
frmKasir = null;
}