difference between synchronous postback and asynchronous postback in ASP.Net?

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What is the difference between synchronous postback and asynchronous postback? I'm beginner in ASP.Net so please define it with code and description.

Posted 17-Sep-12 17:12pm

hiredotnet

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Check out this link for detail:
http://edndoc.esri.com/arcobjects/9.2/NET_Server_Doc/developer/ADF/ajax_callback.htm[^]

Good luck.

Posted 17-Sep-12 18:47pm

Raje_

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Afzal Shaikh · Accepted Answer · 2012-09-17T18:34:00

synchronous postback: Complete page goes to server and back with the result.

asynchronous postback: Partial page/Part of the web goes to the server(concern part) and back with the result.

Example:

If you have 2 drop-downs in your page 1 for country and other for city, binding of the cities in the city drop-down totally depend on the country, instead of sending whole page to the server just send/update those drop-downs to server which are our concern(other page parts will be static so it will remains the same at client sideand no need to send them to server) that will increase performance of our web applications.

Let me know if you still have any confusion.

Thanks,

Prasad_Kulkarni · Accepted Answer · 2012-09-17T19:04:00

* Asynchronous postback renders only the required part of the page; whereas,
synchronous postback renders the entire page for any postback.

* Asynchronous postback executes only one postback at a time, that is, if you have two buttons doing asynchronous postback, the actions will be performed one by one; whereas,
synchronous postback executes all the actions at once.

* Asynchronous postback only modifies the update panel that raises the postback; whereas, synchronous postback modifies the entire page.

Have a look here[^] and more similar threads here[^]

difference between synchronous postback and asynchronous postback in ASP.Net?

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