title: On button click load UserControl without refreshing whole page
body: <p>Explaining my problem: </p>
  
  <p>In my ASP.NET solution i have 2 buttons:</p>
  
  <p>Button 1 and Button 2 </p>
  
  <p>I have two UserControls with totally different content</p>
  
  <p>OnClick of each of those buttons i want to load different UserControl into ContentPlaceHolder, but without reload whole page. So actually it have to work like Ajax TabContainer (but without loading all tabs at once). </p>
  
  <p>I have tried to solve this problem with Ajax TabContainers, but loading times was just awful.</p>
  
  <p>Anyone had same problem? How do u solve this one guys? </p>