public Q getQuestion<Q>(int QuestionID,int ChapterID)where Q:IQuestion,new(){
			if (QuestionID == 0) {
				using (SQLite.SQLiteConnection conn = new SQLite.SQLiteConnection(docPath)) {

					var questionS =(from b in conn.Table<Q> ()
						where b.question_level==0 && b.chapter_id==ChapterID
						select b
					).Take (1);
					List<Q> ListQuestionS=new List<Q>(questionS);


					return ListQuestionS[0];

				}
			} else {
				using (SQLite.SQLiteConnection conn = new SQLite.SQLiteConnection(docPath)) {

					var questionS =new List<Q>(from b in conn.Table<Q> ()
						where b.question_id==QuestionID && b.chapter_id==ChapterID
						select b
					);

					return questionS[0];

				}

			}
		}