private void ByByWindows(object sender, FormClosedEventArgs e) { Form frm; if (sender is Form) { frm = (Form)sender; if (frm == frmLietKeTinhGia) { frmLietKeTinhGia = null; } } }
private void mnuView_QuoteBrowser_Click(object sender, EventArgs e) { if (frmLietKeTinhGia == null) { frmLietKeTinhGia = new LietKeTinhGiaForm(); frmLietKeTinhGia.KieuSapXep = SapXepTinhGiaS.Khong; frmLietKeTinhGia.FormClosed += new FormClosedEventHandler(ByByWindows); frmLietKeTinhGia.MdiParent = this; frmLietKeTinhGia.Show(); } else { frmLietKeTinhGia.Focus(); } }