BloggingSystem.Services.Controllers.PostsController.Create C# (CSharp) Method

        public HttpResponseMessage Create([FromBody]PostModel post,
            [ValueProvider(typeof(HeaderValueProviderFactory<string>))]string sessionKey)
        {
            HttpResponseMessage httpResponse = this.PerformOperation(() =>
            {
                UserValidator.ValidateSessionKey(sessionKey);

                var context = new BloggingSystemContext();
                using (context)
                {
                    var loggedUserEntity = context.Users.FirstOrDefault<User>(u => u.SessionKey == sessionKey);
                    if (loggedUserEntity == null)
                    {
                        throw new InvalidOperationException("Invalid user or pasword!");
                    }

                    var newPostEntity = PostsMapper.CreateNewEntity(post, loggedUserEntity, context);
                    context.Posts.Add(newPostEntity);
                    context.SaveChanges();

                    var postedPost = PostsMapper.ToPostedModel(newPostEntity);
                    var response = this.Request.CreateResponse(HttpStatusCode.Created, postedPost);
                    return response;
                }

            });

            return httpResponse;
        }