IntermediateLevelSharp/InterMediateSharp/WebSocketEchoClient/Program.cs

using System.Net.WebSockets;
using System.Text;

namespace WebSocketEchoClient;

class Program
{
    static async Task Main(string[] args)
    {
        Console.WriteLine("Starting WebSocket Client...");

        using (ClientWebSocket ws = new ClientWebSocket())
        {
            try
            {
                await ws.ConnectAsync(new Uri("ws://echo.websocket.org"), CancellationToken.None);
                Console.WriteLine("Connected!");

                Task receiveTask = ReceiveMessages(ws);
                await SendMessages(ws);

                await receiveTask;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Exception: {ex.Message}");
            }
        }
    }
    static async Task SendMessages(ClientWebSocket ws)
    {
        while (ws.State == WebSocketState.Open)
        {
            string message = Console.ReadLine();
            byte[] bytes = Encoding.UTF8.GetBytes(message);
            await ws.SendAsync(new ArraySegment<byte>(bytes), WebSocketMessageType.Text, true, CancellationToken.None);
        }
    }

    static async Task ReceiveMessages(ClientWebSocket ws)
    {
        byte[] buffer = new byte[1024];

        while (ws.State == WebSocketState.Open)
        {
            WebSocketReceiveResult result = await ws.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
            string message = Encoding.UTF8.GetString(buffer, 0, result.Count);
            Console.WriteLine($"Received: {message}");
        }
    }
}