public void RateTopic(int topicId, int rating)
{
var db = this.GetDbContext();
var r = new UserTopicRating { Rating = rating, TopicId = topicId, UserId = this.GetCurrentUser().Id };
db.UserTopicRatings.InsertOnSubmit(r);
db.SubmitChanges();
}
partial void UpdateUserTopicRating(UserTopicRating instance);
partial void DeleteUserTopicRating(UserTopicRating instance);
partial void InsertUserTopicRating(UserTopicRating instance);