public void DeleteEpic(int id, int projectId)
{
var epic = _projectDAO.GetEpicFromId(id);
foreach (var userStory in epic.UserStories)
{
if (userStory.State != UserStoryState.BACKLOG)
{
throw new CheckedException("Cannot delete epic with used user stories");
}
}
_projectDAO.DeleteEpic(id, projectId);
}