private void createAccount_btn_Click(object sender, EventArgs e) { if (InputServices.TextBoxError(username_txtbx, errorProvider1) && InputServices.TextBoxError(password_txtbx, errorProvider1) && InputServices.TextBoxError(name_txtbx, errorProvider1) && InputServices.TextBoxError(lastName_txtbx, errorProvider1) && InputServices.ComboBoxError(department_combobx, errorProvider1)) { Department department = department_combobx.SelectedItem as Department; accountService.AddNewUser(username_txtbx.Text, password_txtbx.Text, name_txtbx.Text, lastName_txtbx.Text, dayOfBirth_pckr.Value, GenderChoice(), department); Hide(); var mainForm = new MainForm(); mainForm.ShowDialog(); Close(); } }