public ForumData()
 {
     this.Users      = DattaMapper.LoadUsers();
     this.Categories = DattaMapper.LoadCategories();
     this.Posts      = DattaMapper.LoadPosts();
     this.Replies    = DattaMapper.LoadReplies();
 }
 public void SaveChanges()
 {
     DattaMapper.SaveUser(this.Users);
     DattaMapper.SaveCategories(this.Categories);
     DattaMapper.SavePost(this.Posts);
     DattaMapper.SaveReply(this.Replies);
 }