Dynamically add web control

some Check boxes are created dynamically at run time on web page
and rest are created on button click
check box are cretaed successfully but
when i click to any button ,the check boxs which are created by button click dosen't appear
please suggest me and if possibel than give code also
thankx in advance

The dynamically created checkbox's have to be re-created and loaded on each page request, so you should keep a flag in viewstate and check this guy to see if you need to re-created them. Or, you could check out the checkbox list control and see if you can use him.