private void AddUser(object sender, EventArgs e) { // Validating if (CodeNumExists()) { return; } if (!ValidatingTxtCodeNum() || !ValidatingTxtFullName()) { MessageBox.Show(MessageBoxText.RequiredInput, MessageBoxText.CaptionWarning, MessageBoxButtons.OK, MessageBoxIcon.Warning); return; } if (cboTypeUser.SelectedIndex != -1) { string id_user = chkRandomCodeNum.Checked ? txtCodeNum.Text = UserBUS.RandomCodeNum(UserBUS.TypeSelectUser).ToString() : txtCodeNum.Text; id_user = UserBUS.TypeSelectUser + id_user; string password = "******"; string name = txtFullName.Text; DateTime birthday = DateTime.Parse(dtpBirthday.Text); Class classModal = ((Class)cboClass.SelectedItem); User user = new User(id_user, password, name, birthday, classModal); UserBUS.HandleAddUser(lvwMain, user); CountNumberListView(); } }