public IHttpActionResult GetDoubtAnswer(int id)
        {
            DoubtAnswer doubtAnswer = db.DoubtAnswers.Find(id);

            if (doubtAnswer == null)
            {
                return(NotFound());
            }

            return(Ok(doubtAnswer));
        }
        public IHttpActionResult PostDoubtAnswer(DoubtAnswer doubtAnswer)
        {
            if (doubtAnswer == null)
            {
                return(BadRequest(ModelState));
            }

            db.DoubtAnswers.Add(doubtAnswer);
            db.SaveChanges();

            return(Ok(doubtAnswer));
        }
        public IHttpActionResult DeleteDoubtAnswer(int id)
        {
            DoubtAnswer doubtAnswer = db.DoubtAnswers.Find(id);

            if (doubtAnswer == null)
            {
                return(NotFound());
            }

            db.DoubtAnswers.Remove(doubtAnswer);
            db.SaveChanges();

            return(Ok(doubtAnswer));
        }
        public IHttpActionResult UpdateDoubtAnswer(DoubtAnswer doubtAnswer)
        {
            if (doubtAnswer == null)
            {
                return(BadRequest(ModelState));
            }

            try
            {
                db.Entry(doubtAnswer).State = EntityState.Modified;
                db.SaveChanges();
                return(Ok(doubtAnswer));
            }
            catch (Exception e)
            {
                return(InternalServerError());
            }
        }