private void btnConnect_Click(object sender, EventArgs e)
{
context = new SslContext(SslProtocols.Tls12, new X509Certificate2("client.pfx", "qwerty"), (senderr, certificate, chain, sslPolicyErrors) => true);
client = new ChatClient(context, address, port);
// Connect the client
label1.Text = "Client connecting...";
client.ConnectAsync();
label1.Text = "Done!";
}