public async Task<IActionResult> Delete(int? id)
    {
        if (id == null)
        {
            return NotFound();
        }

        var country = await _context.Countries
            .SingleOrDefaultAsync(m => m.Id == id);
        if (country == null)
        {
            return NotFound();
        }

        return PartialView(country);
    }

public class Country
{
    public int Id { get; set; }
    [Required]
    public string Name { get; set; }


}

public class City
{
    public int Id { get; set; }

    [Required]
    public string Name { get; set; }

    public Country Country { get; set; }


}