Working of Ajax

Question

hi,
  i have implemented collapsinle panel for my project.inside the panel i created a form with a button in it.but i click on the button.nothing is getting displayed.When i debugged my code,button click is happening and finally a disassembly is getting opened and is keep on travesing there.i am not getting this issue.i have added ajaxcontrltoolkit.dll 3.5 version as reference.Please help me with this.
Regards,
Sivapratap