private void DanhSachHuyen_Click_1(object sender, EventArgs e) { if (Huyenfrm == null || Huyenfrm.IsDisposed) { Huyenfrm = new frmHuyen(); Huyenfrm.MdiParent = this; Huyenfrm.Show(); } else { Huyenfrm.Activate(); } }
private void ThemHuyen_Click(object sender, EventArgs e) { frmHuyen H = new frmHuyen(); H.ShowDialog(); }