In the earlier few articles, I made a summary of the asynchronous method call. You can click this link to access the details.
So if you read the articles above, you will know we have many many ways to achieve today's topic. Otherwise, in this article I'd like to share the best practice of asynchronous web services call in ASP.NET, as .NET Framework has encapsulated the high-level web service.
I found a similar article in the Code Project. So you can access this article directly, lol.
The points of interest are that we have no necessary to achieve the async encapsulation by ourselives, it's been done by .NET Framework.