private void ButtonRemove_Click(object sender, RoutedEventArgs e)
        {
            if (ListBox1.SelectedIndex < 0)
            {
                MessageBox.Show("Select employee");
                return;
            }

            Employee e1 = ListBox1.SelectedItem as Employee;

            MessageBoxResult mbr = MessageBox.Show("Delete employee: " + e1.ToString(), "Delete", MessageBoxButton.YesNo);

            if (mbr == MessageBoxResult.No)
            {
                return;
            }

            int result = eDal.DeleteEmployee(e1);

            if (result == 0)
            {
                ShowEmployees();
                TextBoxFirstName.Clear();
                TextBoxLastName.Clear();
                TextBoxDateOfBirth.Clear();
                MessageBox.Show("Employee deleted");
            }

            else
            {
                MessageBox.Show("Error");
            }
        }
 public static void DeleteEmployee(int IdEmployee)
 {
     EmployeeDal.DeleteEmployee(IdEmployee);
 }
 public bool DeleteEmployee(Employee ep)
 {
     return(employeeDal.DeleteEmployee(ep) > 0);
 }