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Instead, it uses the more complex but slightly more flexible methodbased Asynchronous Programming Model, in which you call BeginGetRequestStream, passing in a delegate to a method that the request will call back once it s ready to proceed, at which point you call EndGetRequestStream This Begin/End pattern is very common in NET and will be discussed in 16 The second way in which the sending of the request can be triggered is to ask for the response object if you haven t already asked for the request stream (eg, because you re doing a GET, so there is no request body) the request will be sent at this point So GetResponse also has an asynchronous option Again, this uses the method-based asynchronous pattern Example 13-15 shows a version of Example 13-13 modified to get the response object asynchronously..

HttpWebRequest req = (HttpWebRequest) WebRequest.Create("http://oreilly.com/"); req.BeginGetResponse(delegate(IAsyncResult asyncResult) {

using (HttpWebResponse resp = (HttpWebResponse) req.EndGetResponse(asyncResult)) using (Stream respStream = resp.GetResponseStream()) using (StreamReader reader = new StreamReader(respStream)) { string pageContent = reader.ReadToEnd(); Console.WriteLine(pageContent); } }, null);

Type no here to make it autodetect your network settings. You will then be given the CPAN shell prompt on your terminal; it looks like this: cpan>

This example uses an anonymous method as the completion callback, which allows the code to retain a similar structure to the original, synchronous version. But you need to be mindful that the code that handles the response in Example 13-15 is now a separate method, and could run some considerable length of time after the call to Begin GetResponse returns, and probably on a different thread. So as with the event-based pattern, you ll need to ensure that your application runs for long enough for the operation to complete having some outstanding asynchronous operations in progress will not keep your process alive if all of the nonbackground threads exit.

This asynchronous pattern does not take care of UI threading issues (unlike the event-based pattern seen previously). The completion callback will usually occur on some random thread, and attempting to update the user interface from that code will fail. We ll see how to handle this in 16.

Example 13-14 shows just one of the HTTP protocol features you can customize the UserAgent string. Many similar settings are available, many of which are quite obscure, so we won t go through all of them here. That s what the MSDN reference is for. But we will cover the most common cases.

Note: Be sure that you are connected to the Internet before starting the CPAN shell. The CPAN shell will need to

HTTP defines various ways for a client to authenticate itself to the server. Note that most public-facing websites don t actually use any of these a website that presents a login UI where you type a username and password directly into fields in the web page itself isn t using HTTP authentication at all, and is usually relying on cookies instead (more on this later). HTTP authentication gets involved in two main scenarios. The most visible scenario is when the browser opens a small window asking for credentials before it navigates to the web page this is less common than logging in via a form on a web page, but a few websites work this way. Slightly more subtly, HTTP authentication is used for integrated security scenarios for example, when a client machine belongs to a Windows domain, and the user s identity is automatically available to an intranet web server on the same domain. In this case, you don t need to log in explicitly to an intranet site, and yet it knows exactly who you are this is thanks to implicit use of HTTP authentication.

The preceding section showed the default Module1 and workflow code in VB .NET. This section will show the same code in C#. Because only the VB .NET projects were created in 1, the C# projects need to be created now. Create a new C# Sequential workflow console application called CFirstSequentialWFConsoleApplication, and create a new C# State Machine workflow console application called CFirstStateMachineWFConsoleApplication. Open the C# Sequential workflow console application just created. Open the Solution Explorer, and you ll see the file name is different. In VB, the code file for establishing the console application was Module1.vb, but within a C# application it s called Program.cs. First, open the Workflow1.cs file view the code, which follows: