partial void DeleteCustomer(Customer instance);
 partial void UpdateCustomer(Customer instance);
		private void detach_Customer(Customer entity)
		{
			this.SendPropertyChanging();
			entity.Contact = null;
		}
 partial void InsertCustomer(Customer instance);
		private void attach_Customer(Customer entity)
		{
			this.SendPropertyChanging();
			entity.Contact = this;
		}