public IHttpActionResult Put(int id, [FromBody] UserViewModel user)
        {
            try
            {
                //var outDatedUser = UserMapper.DTOtoVMUser(service.GetUserByID(id));

                if (ModelState.IsValid)
                {
                    user.UserID = user.UserID == 0 ? id : user.UserID;
                    var newUserDTO = UserMapper.VMtoDTOUser(user);
                    user = UserMapper.DTOtoVMUser(service.EditUser(newUserDTO));
                    return(Content(HttpStatusCode.OK, user));
                }
                else
                {
                    return(Content(HttpStatusCode.BadRequest, GetModelStateErrors(ModelState)));
                }
            }
            catch (UserAlreadyExistsException e)
            {
                ModelState.AddModelError("", e.Message);
                return(Content(HttpStatusCode.BadRequest, GetModelStateErrors(ModelState)));
            }
            catch (UserDoesNotExistException e)
            {
                ModelState.AddModelError("", e.Message);
                return(Content(HttpStatusCode.NotFound, GetModelStateErrors(ModelState)));
            }
            catch (Exception e /* dex */)
            {
                ModelState.AddModelError("", e.Message);
                return(Content(HttpStatusCode.InternalServerError, GetModelStateErrors(ModelState)));
            }
        }