' The following method demonstrates overriding the
' caching policy for a request.
Public Shared Function GetResponseNoCache(ByVal uri As Uri) As WebResponse
    ' Set a default policy level for the "http:" and "https" schemes.
    Dim policy As New HttpRequestCachePolicy(HttpRequestCacheLevel.Default)
    HttpWebRequest.DefaultCachePolicy = policy
    ' Create the request.
    Dim request As WebRequest = WebRequest.Create(uri)
    ' Define a cache policy for this request only. 
    Dim noCachePolicy As New HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore)
    request.CachePolicy = noCachePolicy
    Dim response As WebResponse = request.GetResponse()
    Console.WriteLine("IsFromCache? {0}", response.IsFromCache)
    Return response
End Function

// The following method demonstrates overriding the
// caching policy for a request.
public static WebResponse GetResponseNoCache(Uri uri)
{
    // Set a default policy level for the "http:" and "https" schemes.
    HttpRequestCachePolicy policy = new HttpRequestCachePolicy(HttpRequestCacheLevel.Default);
    HttpWebRequest.DefaultCachePolicy = policy;
    // Create the request.
    WebRequest request = WebRequest.Create(uri);
    // Define a cache policy for this request only. 
    HttpRequestCachePolicy noCachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore);
    request.CachePolicy = noCachePolicy;
    WebResponse response = request.GetResponse();
    Console.WriteLine("IsFromCache? {0}", response.IsFromCache);            
    return response;
}

// The following method demonstrates overriding the
// caching policy for a request.
static WebResponse^ GetResponseNoCache( Uri^ uri )
{
   // Set a default policy level for the "http:" and "https" schemes.
   HttpRequestCachePolicy^ policy = gcnew HttpRequestCachePolicy( HttpRequestCacheLevel::Default );
   HttpWebRequest::DefaultCachePolicy = policy;

   // Create the request.
   WebRequest^ request = WebRequest::Create( uri );

   // Define a cache policy for this request only. 
   HttpRequestCachePolicy^ noCachePolicy = gcnew HttpRequestCachePolicy( HttpRequestCacheLevel::NoCacheNoStore );
   request->CachePolicy = noCachePolicy;
   WebResponse^ response = request->GetResponse();
   Console::WriteLine( L"IsFromCache? {0}", response->IsFromCache );

   return response;
}