private static async void Chat()
{
var server = new Server();
var client = new Client();
MessageResult result1 = await client.ConnectAsync(server);
result1.ToString(); // SuccessMessageResult.ToString
MessageResult result2 = await server.SendAsync("Hello from server!");
result2.ToString(); // SuccessMessageResult.ToString or ErrorMessageResult.ToString
Task <MessageResult> task = client.SendAsync($"Hello from client {client.Id}!");
MessageResult result3 = await task;
result3.ToString(); // ErrorMessageResult.ToString
}