public void DeleteSubscribe(int projectId)
{
var user = UserService.Include(t => t.Subscriber).Find(s => s.login == User.Identity.Name);
var project = ProjectService
.Include(t => t.ProjectSubscribers)
.Find(t => t.Id == projectId);
var link = project.Subscribers.FirstOrDefault(t => t.Id == user.Subscriber.Id);
SubscribeService.RemoveLink(new ProjectSubscriber()
{
ProjectsId = projectId, SubscribersId = link.Id
});
}