title: The GridView 'GridView1' fired event PageIndexChanging which wasn't handled
body: <p>I have created:</p>
  
  <ul>
  <li>one master page and one content page called Detail.</li>
  <li>On Button click event, displaying data in grid view.</li>
  <li>In grid view, columns are autogenerated.</li>
  <li>I wanted to show 11 column in grid view, but it is more than page
  size.</li>
  </ul>
  
  <p>What to do for this?</p>
  
  <p>I have created sql helper file for database connection code and calling that method, not using sqldatasource for connection.</p>
  
  <p>When I trying to do paging, getting <strong>error</strong>: </p>
  
  <blockquote>
    <p>The GridView 'GridView1' fired event PageIndexChanging which wasn't
    handled.</p>
  </blockquote>