Callback : It is a way to send a request to the web page from the client script. Postback is an expensive call with processing overhead. In callback a client function sends a request and a special marked method is invoked on the
server. It does the processing & returns the value which is received by another client function to process the result. To have client side callbacks, the page has to implement ICallbackEventHandler & implement functions RaiseCallBackEvent & GetCallBackResult.
PostBack: Postback is the event which sends the form data to the server. The server processes the data & sends it back to the browser. The page goes through its full life cycle & is rendered on the browser. It can be triggered by using the
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