static async Task Main()
{
   // Create an HttpClientHandler object and set to use default credentials
   HttpClientHandler handler = new HttpClientHandler();
   handler.UseDefaultCredentials = true;

   // Create an HttpClient object
   HttpClient client = new HttpClient(handler);

   // Call asynchronous network methods in a try/catch block to handle exceptions
   try	
   {
      HttpResponseMessage response = await client.GetAsync("http://www.contoso.com/");

      response.EnsureSuccessStatusCode();

      string responseBody = await response.Content.ReadAsStringAsync();
      Console.WriteLine(responseBody);
   }  
   catch(HttpRequestException e)
   {
       Console.WriteLine("\nException Caught!");	
       Console.WriteLine("Message :{0} ",e.Message);
   }

   // Need to call dispose on the HttpClient and HttpClientHandler objects 
   // when done using them, so the app doesn't leak resources
   handler.Dispose(true);
   client.Dispose(true);
}