Tutorial: ASP.NET .NET ASP.NET Web Services : Asynchronous Programming Tutorial
A complete online chapter 'Asynchronous Programming' from 'Professional ASP.NET Web Services'. Provides in depth information on how and when to implement syncronous and asynchronous processing using web services.
Tutorial Details:
ASP.NET .NET ASP.NET Web Services : Asynchronous Programming Tutorial To wait or not to wait; that is the question! Whether or not to implement asynchronous processing is one of the fundamental issues that a developer must answer when invoking function calls across process boundaries. Given that the option to invoke an asynchronous call is available, the programmer has to weigh the relative ease of coding synchronous calls with its inherent drawback - when a synchronous call is made, the calling thread is blocked and has to wait until the function completes.
In many instances, this is an acceptable shortcoming, as in the case when a program's logic flow should not continue until data is retrieved from a database. Asynchronous processing, on the other hand, allows more parallelism. A thread that initiates an asynchronous call is not blocked and can therefore do almost any computation while the method is in transit. The case for asynchronous processing becomes very compelling in the enterprise computing space where systems need to handle hundreds of thousands of function call requests and synchronicity may become a barrier to scalability.
Web Services support both synchronous and asynchronous communication between the client application and the server hosting the service. Since both are supported, the developer is challenged with deciding which type of process to initiate in their application. In this chapter, we're going to dive into the subject of synchronous and asynchronous programming as it pertains to ASP.NET Web Services. We'll explore the mechanics of invoking Web Services via an asynchronous mechanism. We'll also look into the .NET framework and how it provides the infrastructure for asynchronous processing.
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