public void RemoveLearntTopic(LearntTopic learntTopic)
 {
     using (var db = new DbContext())
     {
         db.Connection.Delete(learntTopic);
     }
 }
 public void AddLearntTopic(LearntTopic learntTopic)
 {
     using (var db = new DbContext())
     {
         db.Connection.Insert(learntTopic);
     }
 }