public void UpdateInstance(AnswerInstance instance)
 {
     var ctx = QuizlrContext.Current;
     ctx.AnswerInstances.Attach(instance);
     ctx.Entry(instance).State = EntityState.Modified;
     ctx.SaveChanges();
 }
 public AnswerInstance CreateInstance(AnswerInstance instance)
 {
     var ctx = QuizlrContext.Current;
     ctx.AnswerInstances.Add(instance);
     ctx.SaveChanges();
     return instance;
 }
 public void DeleteInstance(AnswerInstance instance)
 {
     var ctx = QuizlrContext.Current;
     ctx.AnswerInstances.Remove(instance);
     ctx.SaveChanges();
 }