private void btnBanHang_ItemClick(object sender, ItemClickEventArgs e) { Form f = IsActive(typeof(frmService)); if (f != null) { f.Activate(); } else { f = new frmService(); f.MdiParent = this; f.Show(); } }
private void frmMain_Load(object sender, EventArgs e) { Form f = IsActive(typeof(frmService)); if (f != null) { f.Activate(); } else { f = new frmService(); f.MdiParent = this; f.Show(); } }