// PUT api/EventSymposium/5
        public IHttpActionResult PutEvent_Symposium(int id, Event_Symposium event_symposium)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != event_symposium.Reg_ID)
            {
                return BadRequest();
            }

            db.Entry(event_symposium).State = EntityState.Modified;

            try
            {
                db.SaveChanges();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!Event_SymposiumExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public IHttpActionResult PostEvent_Symposium(Event_Symposium event_symposium)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            db.Event_Symposium.Add(event_symposium);
            db.SaveChanges();

            return CreatedAtRoute("DefaultApi", new { id = event_symposium.Reg_ID }, event_symposium);
        }