https://learn.microsoft.com/tr-tr/dotnet/api/system.web.websockets.aspnetwebsocket.receiveasync?view=netframework-4.8.1
AspNetWebSocket.ReceiveAsync(ArraySegmentByte, CancellationToken) Method (System.Web.WebSockets)...
Receives a single message fragment from a remote client.
system webcancellationtokenmethodwebsockets