public void AddTagToPhoto(int idPhotom, string tagName)
        {
            Tag tag = unitOfWork.Tags.NameInTag(tagName);
            if (tag == null)
            {
                tag = new Tag { Name = tagName };
                unitOfWork.Tags.Create(tag);
                unitOfWork.Save();
            }

            Photo photo = unitOfWork.Photos.GetById(idPhotom);
            photo.Tags.Add(unitOfWork.Tags.NameInTag(tagName));
            unitOfWork.Save();
        }
 public void Create(Tag tag)
 {
     db.Tags.Add(tag);
 }