// PUT /api/<controller>/5
 public void Put(ImageModel value)
 {
     var match = Get(value.Id);
     if (match == null) return;
     match.Name = value.Name;
     match.Data = value.Data;
 }
 // POST /api/<controller>
 public void Post(ImageModel value)
 {
     _backgroundImages.Add(value);
 }