public async Task <Boolean> Delete(int userId, int concertId)
{
UserConcertLink link = new UserConcertLink(userId, concertId);
return(await _userConcertLinkService.DeleteItem(link));
}
public async Task <UserConcertLink> AddNewItem([FromBody] UserConcertLink item)
{
return(await _userConcertLinkService.AddNewItem(item));
}