Answer Posted / swapna

1. Asynchronous Call

Application can make a call to the Webservice and then
continue to do whatever it wants to do. When the service is
ready it will notify the application. Application can use
BEGIN and END method to make asynchronous call to the web
method. We can use either a WaitHandle or a Delegate object
when making asynchronous call.


The WaitHandle class share resources between several
objects. It provides several methods which will wait for
the resources to become available.


The easiest and most powerful way to implement an
asynchronous call is using a delegate object. A delegate
object wraps up a callback function. The idea is to pass a
method in the invocation of the web method. When the web
method has finished it will call this callback function to
process the result.

2. Synchronous Call
Application has to wait until execution has completed.

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