private void button1_Click(object sender, EventArgs e) { string maMon = (string)textBoxMaMon.Text; string tenMon = (string)textBoxTenMon.Text; string slot = (string)textBoxSlot.Text; if (!checkFormat(maMon, tenMon, slot)) { return; } int adminID = Admin.getAdminIdByUser(a.User1); if (adminID == 0) { MessageBox.Show("Can't not find out " + a.User1); return; } MonHoc m = new MonHoc(maMon, tenMon, Convert.ToInt32(slot)); if (!MonHoc.insertMonHoc(m)) { return; } DateTime d = DateTime.Now; if (HistoryAction.insertHistoryAction(adminID, "Insert", d, "Insert MonHoc with MaMonHoc: " + m.MaMh1 + ", TenMh: " + m.TenMh1 + " ,slot: " + m.Slot1)) { MessageBox.Show("Add Success"); } }