The GetResponse method sends a request to an Internet resource and returns a WebResponse instance. If the request has already been initiated by a call to GetRequestStream, the GetResponse method completes the request and returns any response.
The WebRequest class is an abstract class. The actual behavior of WebRequest instances at run time is determined by the descendant class returned by the WebRequest.Create method. For more information about default values and exceptions, see the documentation for the descendant classes, such as HttpWebRequest and FileWebRequest.
If a WebException is thrown, use the Response and Status properties of the exception to determine the response from the server.