public void InsertPost(Post message) { this.MyPosts.Add(message); List <Post> Plist = new List <Post>(); Plist.Add(message); if (MyBoard.ContainsKey(message.Author)) { this.MyBoard[message.Author].Add(message); } else { this.MyBoard.Add(key: message.Author, value: Plist); this.MyUsers.Add(message.Author); } }