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I need to add onclick event to some dynamically added button, but when i click the button, the onclick event is not fired. I saw some solutions to this, like link which says I should create the controls and attach the event on page_init or page_load every time there is a request, but, will this make the website very slow if I have a lot of controls to add?
Yes, you must recreate dynamic controls if you want to access them and have their events fire on postback.
If you have so many controls on a page that your site is slow, you have a design issue. Rethink your design so you do not have so many controls on one page (perhaps several pages/tabs?).