TcpClientOpenStreamAsync(String, Int32, Flags) Method

public static Task<Client<IByteStreamService>> OpenStreamAsync(
	string host,
	int port,
	Flags flags = default
)

public async Task SendMessageAsync(string host, int port) {
    // Open a connection to a client.
    var client = await TcpClient.OpenStreamAsync(sync: false, host, port);

    // Send a message.
    var message = new byte[4];
    await client.IO.Stream.WriteAsync(message);

    // Close the connection.
    client.Close();
}