private void btnLogin_Click(object sender, EventArgs e) { List <Employee> employees = DBConnection.getEmployee(Int32.Parse(txtEmployeeCode.Text)); if (employees.Count() != 0) { foreach (var item in employees) { Employee employee = new Employee(item.EmployeeCode, item.FullName, item.Address); AlterBooksForm bookForm = new AlterBooksForm(employee); bookForm.Show(); } this.Close(); } else { MessageBox.Show("User name or password is wrong please try again"); } }