private bool FilterProduct(Product entity)
 {
     return (entity.Id == this.ProductID);
 }
 private void DetachProducts(Product entity)
 {
     entity.Image = null;
 }
 private bool FilterProducts(Product entity)
 {
     return (entity.ImageId == this.Id);
 }
 private void AttachProducts(Product entity)
 {
     entity.Image = this;
 }