Asynchronous and synchronous postback in ASP.NET

Question

What are the differences between asynchronous and synchronous postback?

Answer 1

Asynchronous postback are generally used to provide enhanced browser functionality with the help of javascript. for example , filling designations in an department based on a department selected in a dropdownlist without causing a full page refresh.

use can use ASP Update panels- http://www.asp.net/Ajax/Documentation/Live/overview/UpdatePanelOverview.aspx

XMLHTTP REQUEST to call asp.net pages http://www.w3schools.com/XML/xml_http.asp

ASP>NET AJAX and web services http://www.asp.net/Ajax/Documentation/Live/tutorials/ExposingWebServicesToAJAXTutorial.aspx