private void paycmd_Click(object sender, EventArgs e)
{
invoiceid = Convert.ToString(invoicetxt.Text.Trim());
if (ip == null)
{
ip = new InvoicePayment();
ip.MdiParent = this.MdiParent;
ip.FormClosed += new FormClosedEventHandler(ip_FormClosed);
ip.Show();
this.Close();
}
else
{
ip.Activate();
ip.FormClosed += new FormClosedEventHandler(ip_FormClosed);
ip.Show();
}
}
void ip_FormClosed(object sender, FormClosedEventArgs e)
{
ip = null;
}