partial void InsertTech(Tech instance);
		private void detach_Teches(Tech entity)
		{
			this.SendPropertyChanging();
			entity.Tech1 = null;
		}
 partial void DeleteTech(Tech instance);
		private void attach_Teches(Tech entity)
		{
			this.SendPropertyChanging();
			entity.Tech1 = this;
		}
 partial void UpdateTech(Tech instance);