public void Add(PhotoDTO pdto)
        {
            foreach (Photo p in pdto.Photos)
            {
                //First, turn off the current IsPrimary for this user if this pic is priamary.  Code referenced from following url:
                //http://www.dotnetlearners.com/blogs/view/142/update-multiple-records-in-entity-framework-in-a-single-line-by-using-linq-query.aspx

                if (p.IsPrimary == true)
                {
                    base.Photos.Where(x => x.ID == p.ID && x.IsPrimary == true).ToList().ForEach(x =>
                    {
                        x.IsPrimary = false;
                    });
                }

                //now insert
                base.Photos.Add(p);
            }

            SaveChanges();
        }
        public void Update(PhotoDTO pdto)
        {
            foreach (Photo p in pdto.Photos)
            {
                //First, turn off the current IsPrimary for this user.  Code referenced from following url:
                //http://www.dotnetlearners.com/blogs/view/142/update-multiple-records-in-entity-framework-in-a-single-line-by-using-linq-query.aspx

                if (p.IsPrimary == true)
                {
                    base.Photos.Where(x => x.ID == p.ID && x.IsPrimary == true).ToList().ForEach(x =>
                    {
                        x.IsPrimary = false;
                    });
                }

                //Now, the update with new IsPrimary
                base.Photos.Attach(p);
                base.Entry(p).Property(a => a.IsPrimary).IsModified = true;
            }

            SaveChanges();
        }