private void barButtonItem_DMLoaiDat_ItemClick(object sender, ItemClickEventArgs e) { if (formDMLoaiDat == null) { formDMLoaiDat = new F_Main_DMLoaiDat(); formDMLoaiDat.MdiParent = this; formDMLoaiDat.FormClosed += new FormClosedEventHandler(formDMLoaiDat_FormClosed); formDMLoaiDat.Show(); } else { formDMLoaiDat.Activate(); } }
void formDMLoaiDat_FormClosed(object sender, FormClosedEventArgs e) { formDMLoaiDat = null; }