private void dataMortag3BillBarCodeFrmToolStripMenuItem_Click(object sender, EventArgs e) { if (FrmDataMortag3BillBarCode.IsDisposed) { FrmDataMortag3BillBarCode = new DataMortag3BillBarCodeFrm(); FrmDataMortag3BillBarCode.MdiParent = this; FrmDataMortag3BillBarCode.Show(); } else { if (FrmDataMortag3BillBarCode.Visible) { FrmDataMortag3BillBarCode.WindowState = FormWindowState.Normal; FrmDataMortag3BillBarCode.Focus(); } else { FrmDataMortag3BillBarCode.MdiParent = this; FrmDataMortag3BillBarCode.Show(); } } }