public async Task <IHttpActionResult> DeletePost(int id)
        {
            try
            {
                ApplicationUser user = this.userRepository.GetOneById(User.Identity.GetUserId());
                if (user == null)
                {
                    return(BadRequest("Invalid Token"));
                }

                Topic t = this.repository.GetOneById(id);
                if (t.creatorId == user.Id || User.IsInRole("Admin"))
                {
                    repository.DeleteOneById(id);
                    return(Ok("Topic Deleted"));
                }
                else
                {
                    return(BadRequest("Cannot delete a Topic which you are not an admin of!"));
                }
            }
            catch
            {
                return(BadRequest("Bad Request"));
            }
        }