C# 0 The Complete Reference

Create( )

 and 

GetResponse( )

 could have 

been written like this:

// First, create a WebRequest to a URI.

WebRequest req =  WebRequest.Create("http://www.McGraw-Hill.com");

// Next, send that request and return the response.

WebResponse resp =  req.GetResponse();

In cases in which you don’t need to employ a cast to a specific type of protocol implementation, 

it is better to use 

WebRequest

 and 

WebResponse

 because it allows protocols to be changed 

with no impact on your code. However, since all of the examples in this chapter will be using 

HTTP, and a few will be using HTTP-specific features, the programs will use