public async Task<IHttpActionResult> PutRoutePoint(Guid id, RoutePoint routePoint)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            if (id != routePoint.RoutePointId)
            {
                return BadRequest();
            }

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

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!RoutePointExists(id))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return StatusCode(HttpStatusCode.NoContent);
        }
        public async Task<IHttpActionResult> PostRoutePoint(RoutePoint routePoint)
        {
            if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            routePoint.RoutePointId = Guid.NewGuid();
            db.RoutePoints.Add(routePoint);

            try
            {
                await db.SaveChangesAsync();
            }
            catch (DbUpdateException)
            {
                if (RoutePointExists(routePoint.RoutePointId))
                {
                    return Conflict();
                }
                else
                {
                    throw;
                }
            }

            return CreatedAtRoute("DefaultApi", new { id = routePoint.RoutePointId }, routePoint);
        }