创建 WebRequest 实例并返回响应
public class WebRequestGetExample
    {
public static void Main ()
        {
// Create a request for the URL. 		
            WebRequest request = WebRequest.Create ("http://www.cnblogs.com/kingdom_0");
// If required by the server, set the credentials.
            request.Credentials = CredentialCache.DefaultCredentials;
// Get the response.
            HttpWebResponse response = (HttpWebResponse)request.GetResponse ();
// Display the status.
            Console.WriteLine (response.StatusDescription);
// Get the stream containing content returned by the server.
            Stream dataStream = response.GetResponseStream ();
// Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader (dataStream);
// Read the content.
string responseFromServer = reader.ReadToEnd ();
// Display the content.
            Console.WriteLine (responseFromServer);
// Cleanup the streams and the response.
            reader.Close ();
            dataStream.Close ();
            response.Close ();
        }
    }