Cannot access a disposed object.
Object name: 'frmBill'.
private void distributorBillToolStripMenuItem_Click(object sender,System.EventArgs e)
{
frmBill objfrmBill = frmBill.GetChildInstance();
objfrmBill.MdiParent = this;
objfrmBill.Show();
objfrmBill.BringToFront();
}