private void LoaiVay_Click(object sender, EventArgs e) { if (LoaiVayfrm == null || LoaiVayfrm.IsDisposed) { LoaiVayfrm = new frmLoaiVay(); LoaiVayfrm.MdiParent = this; LoaiVayfrm.Show(); } else { LoaiVayfrm.Activate(); } }
private void btnThemloaivay_Click(object sender, EventArgs e) { frmLoaiVay LV = new frmLoaiVay(); LV.ShowDialog(); }