' Create a new 'Uri' object with the mentioned string.
            Dim myUri As New Uri("http://www.contoso.com")
            ' Create a new 'HttpWebRequest' object with the above 'Uri' object.
            Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(myUri), HttpWebRequest)
            ' Create a new 'DateTime' object.
            Dim today As DateTime = DateTime.Now
            If DateTime.Compare(today, myHttpWebRequest.IfModifiedSince) = 0 Then
                ' Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
                Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
                Console.WriteLine("Response headers " + ControlChars.Cr + "{0}" + ControlChars.Cr, myHttpWebResponse.Headers)
                Dim streamResponse As Stream = myHttpWebResponse.GetResponseStream()
                Dim streamRead As New StreamReader(streamResponse)
                Dim readBuff(256) As [Char]
                Dim count As Integer = streamRead.Read(readBuff, 0, 256)
                Console.WriteLine(ControlChars.Cr + "The contents of Html Page are :  " + ControlChars.Cr)
                While count > 0
                    Dim outputData As New [String](readBuff, 0, count)
                    Console.Write(outputData)
                    count = streamRead.Read(readBuff, 0, 256)
                End While
           ' Close the Stream object.
        streamResponse.Close()
        streamRead.Close()
           ' Release the HttpWebResponse Resource.
        myHttpWebResponse.Close()
                Console.WriteLine(ControlChars.Cr + "Press 'Enter' key to continue.................")
                Console.Read()
            Else
                Console.WriteLine((ControlChars.Cr + "The page has been modified since " + today))
            End If

            // Create a new 'Uri' object with the mentioned string.
            Uri myUri =new Uri("http://www.contoso.com");            
            // Create a new 'HttpWebRequest' object with the above 'Uri' object.
            HttpWebRequest myHttpWebRequest= (HttpWebRequest)WebRequest.Create(myUri);
            // Create a new 'DateTime' object.
            DateTime today= DateTime.Now;
            if (DateTime.Compare(today,myHttpWebRequest.IfModifiedSince)==0)
            {
                // Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
                HttpWebResponse myHttpWebResponse=(HttpWebResponse)myHttpWebRequest.GetResponse();
                Console.WriteLine("Response headers \n{0}\n",myHttpWebResponse.Headers);
                Stream streamResponse=myHttpWebResponse.GetResponseStream();
                StreamReader streamRead = new StreamReader( streamResponse );
                Char[] readBuff = new Char[256];
                int count = streamRead.Read( readBuff, 0, 256 );
                Console.WriteLine("\nThe contents of Html Page are :  \n");    
                while (count > 0) 
                {
                    String outputData = new String(readBuff, 0, count);
                    Console.Write(outputData);
                    count = streamRead.Read(readBuff, 0, 256);
                }
                // Close the Stream object.
                streamResponse.Close();
                streamRead.Close();
                // Release the HttpWebResponse Resource.
                myHttpWebResponse.Close();
                Console.WriteLine("\nPress 'Enter' key to continue.................");    
                Console.Read();
            }
            else
            {
                Console.WriteLine("\nThe page has been modified since "+today);
            }

      // Create a new 'Uri' object with the mentioned string.
      Uri^ myUri = gcnew Uri( "http://www.contoso.com" );

      // Create a new 'HttpWebRequest' object with the above 'Uri' object.
      HttpWebRequest^ myHttpWebRequest = dynamic_cast<HttpWebRequest^>(WebRequest::Create( myUri ));

      // Create a new 'DateTime' object.
      DateTime today = DateTime::Now;
      if ( DateTime::Compare( today, myHttpWebRequest->IfModifiedSince ) == 0 )
      {

         // Assign the response object of 'HttpWebRequest' to a 'HttpWebResponse' variable.
         HttpWebResponse^ myHttpWebResponse = dynamic_cast<HttpWebResponse^>(myHttpWebRequest->GetResponse());
         Console::WriteLine( "Response headers \n {0}\n", myHttpWebResponse->Headers );
         Stream^ streamResponse = myHttpWebResponse->GetResponseStream();
         StreamReader^ streamRead = gcnew StreamReader( streamResponse );
         array<Char>^readBuff = gcnew array<Char>(256);
         int count = streamRead->Read( readBuff, 0, 256 );
         Console::WriteLine( "\nThe contents of Html Page are :  \n" );
         while ( count > 0 )
         {
            String^ outputData = gcnew String( readBuff,0,count );
            Console::Write( outputData );
            count = streamRead->Read( readBuff, 0, 256 );
         }
         streamResponse->Close();
         streamRead->Close();

         // Release the HttpWebResponse Resource.
         myHttpWebResponse->Close();
         Console::WriteLine( "\nPress 'Enter' key to continue................." );
         Console::Read();
      }
      else
      {
         Console::WriteLine( "\nThe page has been modified since {0}", today );
      }
   }
   catch ( WebException^ e ) 
   {
      Console::WriteLine( "\nWebException Caught!" );
      Console::WriteLine( "Source  : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "\nException raised!" );
      Console::WriteLine( "Source  : {0}", e->Source );
      Console::WriteLine( "Message : {0}", e->Message );
   }

}