How to connect via web socket in C#?

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C#

WebSocket-server

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I want to connect via web socket in asp.net with c#. I am having client project as a windows application and server project hosted as windows service with local system mode.

I am unable to connect the client to server. If server project is a windows application no such issue.

What I have tried:

Core Code as below:
Connect("ws://10.15.15.80/service.svc");

public async Task Connect(string uri)
     {



         NeSTCommonClass.WriteTextFile(LogPath + Logfilename, "Client:Handshake Connectivity  Process Sending from Client Level Process Starts", true);
         Thread.Sleep(1000); //wait for a sec, so server starts and ready to accept connection..

         // ClientWebSocket webSocket = null;
         try
         {
             webSocket = new ClientWebSocket();
             await webSocket.ConnectAsync(new Uri(uri), CancellationToken.None);
             NeSTCommonClass.WriteTextFile(LogPath + Logfilename, "Client:Handshake Connectivity  Process Sending from Client Level Process Ends", true);


             await Task.WhenAll(Receive(webSocket));



         }
         catch (Exception ex)
         {
             NeSTCommonClass.WriteTextFile(LogPath + Logfilename, "Client:HandShake Connectivity Process Failed: " + ex.Message.ToString() + "", true);


         }
         finally
         {
             if (webSocket != null)
                 webSocket.Dispose();
             //Console.WriteLine();
             //Console.WriteLine("WebSocket closed.");
         }
         NeSTCommonClass.WriteTextFile(LogPath + Logfilename, "Client:Handshake Connectivity  Process Sending from Client Level Process Ends", true);
     }