How to send a message to Specific Destination through ClientWebSocket in .Net

I have a WebSocket server written in Java and I need to create a Client in .Net I am using .Net Library System.Net.WebSockets However the server expects the message to be sent to a specific destination some thing like(/app/message). However through websocket.Send method I can only pass the actual message. (ex in java stompSession.send("/app/destination", "actual Message"))

How Can I send a message to specific destination using ClientWebSocket.

var socket =new ClientWebSocket();
socket.ConnectAsync(new Uri("ws://example"), CancellationToken.None).Wait();
var data = System.Text.Encoding.UTF8.GetBytes("Hi from Client!");
var si = socket.SendAsync(data, WebSocketMessageType.Text,true,CancellationToken.None);
Console.WriteLine("Sent");
var byt = new byte[4096];
var response = new ArraySegment<byte>(byt);
var res =  socket.ReceiveAsync(response, CancellationToken.None);
var responseText = System.Text.Encoding.UTF8.GetString(response);
Console.WriteLine(responseText);
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