C#BinaryWrite over SSL

using System;
using System.IO;
using System.Net.Sockets;
using System.Security.Authentication;
using System.Security.Cryptography.X509Certificates;

public static void Main()
{
    using (var client = new TcpClient("example.com", 443))
    using (var sslStream = new SslStream(client.GetStream(), false, ValidateServerCertificate))
    {
        try
        {
            sslStream.AuthenticateAsClient("example.com", null, SslProtocols.Tls12, false);

            using (var writer = new BinaryWriter(sslStream))
            {
                writer.Write("Hello, world!");
            }
        }
        catch (AuthenticationException e)
        {
            Console.WriteLine("Authentication failed - closing the connection.");
            client.Close();
            return;
        }
    }
}

private static bool ValidateServerCertificate(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
    if (sslPolicyErrors == SslPolicyErrors.None)
        return true;

    Console.WriteLine("Certificate error: {0}", sslPolicyErrors);

    return false;
}