Public Delegate Function RemoteCertificateValidationCallback ( _
    sender As Object, _
    certificate As X509Certificate, _
    chain As X509Chain, _
    sslPolicyErrors As SslPolicyErrors _
) As Boolean

Dim instance As New RemoteCertificateValidationCallback(AddressOf HandlerMethod)

public delegate bool RemoteCertificateValidationCallback (
    Object sender,
    X509Certificate certificate,
    X509Chain chain,
    SslPolicyErrors sslPolicyErrors
)

public delegate bool RemoteCertificateValidationCallback (
    Object^ sender, 
    X509Certificate^ certificate, 
    X509Chain^ chain, 
    SslPolicyErrors sslPolicyErrors
)

/** @delegate */
public delegate boolean RemoteCertificateValidationCallback (
    Object sender, 
    X509Certificate certificate, 
    X509Chain chain, 
    SslPolicyErrors sslPolicyErrors
)

JScript では、デリゲートは使用できますが、新規に宣言することはできません。

      
// The following method is invoked by the RemoteCertificateValidationDelegate.
public static bool ValidateServerCertificate(
      object sender,
      X509Certificate certificate,
      X509Chain chain,
      SslPolicyErrors sslPolicyErrors)
{
   if (sslPolicyErrors == SslPolicyErrors.None)
        return true;

    Console.WriteLine("Certificate error: {0}", sslPolicyErrors);
    
    // Do not allow this client to communicate with unauthenticated servers.
    return false;
}

// Create a TCP/IP client socket.
// machineName is the host running the server application.
TcpClient client = new TcpClient(machineName,443);
Console.WriteLine("Client connected.");
// Create an SSL stream that will close the client's stream.
SslStream sslStream = new SslStream(
    client.GetStream(), 
    false, 
    new RemoteCertificateValidationCallback (ValidateServerCertificate), 
    null
    );
// The server name must match the name on the server certificate.
try 
{
    sslStream.AuthenticateAsClient(serverName);
} 
catch (AuthenticationException e)
{
    Console.WriteLine("Exception: {0}", e.Message);
    if (e.InnerException != null)
    {
        Console.WriteLine("Inner exception: {0}", e.InnerException.Message);
    }
    Console.WriteLine ("Authentication failed - closing the connection.");
    client.Close();
    return;
}