partial void DeleteProblemUser(ProblemUser instance);
 partial void UpdateProblemUser(ProblemUser instance);
		private void detach_ProblemUsers(ProblemUser entity)
		{
			this.SendPropertyChanging();
			entity.Problem = null;
		}
 partial void InsertProblemUser(ProblemUser instance);
		private void attach_ProblemUsers(ProblemUser entity)
		{
			this.SendPropertyChanging();
			entity.Problem = this;
		}