title: ajax is not working
body: <p>i have a web application and in this i am using ajax controls.
  due to some problem i remove the reference of ajaxcontroltoolkit and reset the toolbox of visual studio. After some i again add reference of previous ajaxcontroltoolkit and add tab in visual studio toolbox.
  Now problem is that when i insert the control of newly installed ajaxcontroltoolkit and run the webapplication the no event(which is in update panel) or no ajax validation fire.
  so please help what should i do
  lot of time i try and remove and add reference of ajaxcontroltoolkit but not working.</p>