What is Difference between Callbacks and Postback in
ASP.NET?



What is Difference between Callbacks and Postback in ASP.NET?..

Answer / alb.shah

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
server controls.

Callback is also the form of Postback, but the difference
is in postback execute a complete page life cycle and whole
page redraw, in callback only specific portion (Contorl) is
executed/redraw using client side scriptiong.

Is This Answer Correct ?    9 Yes 0 No

Post New Answer

More ASP.NET Interview Questions

What is Auto-event wireup? what is the default value for this? when u change the value what will happen?

1 Answers   CMC,


About delegates ?

7 Answers   TCS,


What is the need of client side and server side validation ?

1 Answers   Keane India Ltd,


What is asp.net web application?

0 Answers  


What are various authentication mechanisms in ASP.NET ?

4 Answers   TCS,


Explain the advantages of caching?

0 Answers  


What is the behavior of a Web browser when it receives an invalid element?

0 Answers   MindCracker,


Define dll hell?

0 Answers  


Difference between dynamic query and static query ?

1 Answers   DELL,


What data types do the RangeValidator control support?

2 Answers   Siebel Systems,


Why we use content place holder in asp.net?

0 Answers  


main difference between asp.net2.0,asp.net1.1,asp.net1.0

1 Answers   Northgate is,


Categories