private void MenuInvoicePrint_Click(object sender, EventArgs e)
{
FrmInvoicePrint frm = FrmInvoicePrint.GetSingleton();
frm.MdiParent = this;
frm.Show();
frm.Activate();
}
public static FrmInvoicePrint GetSingleton()
{
if (frm == null || frm.IsDisposed)
{
frm = new FrmInvoicePrint();
}
return(frm);
}