title: Add/Delete Items from DataContext
body: <p>How can I add or delete items from my DataContext? This is my code:</p>
  
  <pre><code>class WallModel
  {
      public WallModel()
      {
          WallItems = new ObservableCollection&lt;Wall&gt;();
          Initialization = InitializeAsync();
  
      }
      public Task Initialization { get; private set; }
      public async Task InitializeAsync()
      {
              WallItems.Add(new Wall { id = 2, user = 3 });
      }
      public ObservableCollection&lt;Wall&gt; WallItems { get; set; }
  }
  </code></pre>
  
  <p>And MainPage.xaml.cs:</p>
  
  <pre><code>public MainPage()
  {
      this.InitializeComponent();
      DataContext = new WallModel();
      lvMain.DataContext = DataContext;
  }
  </code></pre>