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