partial void UpdateProduct(Product instance);
 partial void DeleteProduct(Product instance);
 partial void InsertProduct(Product instance);
 private void detach_Products(Product entity)
 {
     this.SendPropertyChanging();
     entity.Category = null;
 }
 private void attach_Products(Product entity)
 {
     this.SendPropertyChanging();
     entity.Category = this;
 }
 private void detach_Products(Product entity)
 {
     this.SendPropertyChanging();
     entity.Supplier = null;
 }
 private void attach_Products(Product entity)
 {
     this.SendPropertyChanging();
     entity.Supplier = this;
 }