Consuming a Web Service in .Net with X509 token

Question

Consuming a web service seems pretty straight forward in .net, you create the proxy and then use in code. The web service I am trying to hit has token security, so straight out of MSDN documentation I created the following method:

    public void SecureMessage(SoapEnvelope envelope, Security security)
    {
        X509SecurityToken signatureToken = GetSecurityToken("CN=WSE2QuickStartClient");
        if (signatureToken == null)
        {
            throw new SecurityFault("Message Requirements could not be satisfied.");
        }

        // Add the security token.                
        security.Tokens.Add(signatureToken);
        // Specify the security token to sign the message with.
        MessageSignature sig = new MessageSignature(signatureToken);

        security.Elements.Add(sig);
    }

My question is, how can I use this method and call the web service? Has anyone done this before? I wouldn't think it that difficult, but must admit I am stumped here.