Different ways of accessing web service

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.