' Assuming "Windows Authentication" has been set as; 
' Directory Security settings for default web site in IIS.
Dim url As String = "http://localhost"
' Create a 'HttpWebRequest' object with the specified url. 
Dim myHttpWebRequest As HttpWebRequest = CType(WebRequest.Create(url), HttpWebRequest)
' Assign the credentials of the logged in user or the user being impersonated.
myHttpWebRequest.Credentials = CredentialCache.DefaultCredentials
' Send the 'HttpWebRequest' and wait for response.            
Dim myHttpWebResponse As HttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
Console.WriteLine("Authentication successful")
Console.WriteLine("Response received successfully")

// Ensure Directory Security settings for default web site in IIS is "Windows Authentication".
string url = "http://localhost";
// Create a 'HttpWebRequest' object with the specified url. 
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url); 
// Assign the credentials of the logged in user or the user being impersonated.
myHttpWebRequest.Credentials = CredentialCache.DefaultCredentials;
// Send the 'HttpWebRequest' and wait for response.            
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse(); 
Console.WriteLine("Authentication successful");
Console.WriteLine("Response received successfully");

// Ensure Directory Security settings for default web site in IIS is "Windows Authentication".
String^ url = "http://localhost";

// Create a 'HttpWebRequest' object with the specified url.
HttpWebRequest^ myHttpWebRequest = dynamic_cast<HttpWebRequest^>(WebRequest::Create( url ));

// Assign the credentials of the logged in user or the user being impersonated.
myHttpWebRequest->Credentials = CredentialCache::DefaultCredentials;

// Send the 'HttpWebRequest' and wait for response.
HttpWebResponse^ myHttpWebResponse = dynamic_cast<HttpWebResponse^>(myHttpWebRequest->GetResponse());
Console::WriteLine( "Authentication successful" );
Console::WriteLine( "Response received successfully" );