private void detach_Contacts(Contact entity)
		{
			this.SendPropertyChanging();
			entity.User = null;
		}
		private void attach_Contacts(Contact entity)
		{
			this.SendPropertyChanging();
			entity.User = this;
		}
 partial void UpdateContact(Contact instance);
 partial void DeleteContact(Contact instance);
 partial void InsertContact(Contact instance);