title: Get the highlighted text
body: <p>When I select some text in the <code>&lt;div&gt;</code>, I want that highlighted text to appear in the textbox which is just below the div. How can I do it?</p>
  
  <pre><code>&lt;div&gt;
      My text goes here.
  &lt;/div&gt;
  &lt;asp:TextBox ID="txt" runat="server"/&gt;
  </code></pre>