title: WPF VB.NET : Object reference not set to an instance of an object
body: <p>I just wanted to take a listbox value to existing labels on different forms. an error on this code :</p>
  
  <pre><code>keyword.Content = w_list.ListBox1.SelectedItem.ToString
  </code></pre>
  
  <p><strong>error : Object reference not set to an instance of an object.</strong></p>
  
  <p>can anybody help me?</p>