private void barButtonItem_LDSauGiao_ItemClick(object sender, ItemClickEventArgs e) { if (formMucDichSuDungDat == null) { formMucDichSuDungDat = new F_Main_MucDichSuDungDat(); formMucDichSuDungDat.MdiParent = this; formMucDichSuDungDat.FormClosed += new FormClosedEventHandler(formMucDichSuDungDat_FormClosed); formMucDichSuDungDat.Show(); } else { formMucDichSuDungDat.Activate(); } }
void formMucDichSuDungDat_FormClosed(object sender, FormClosedEventArgs e) { formMucDichSuDungDat = null; }