How to maintain the connectivity after successful handshaking in web socket using C#?

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C#

WebSockets

I am doing handshaking via web socket connectivity. My message for handshake has reached server but the connection is not remaining alive or so. I need to maintain the connection state even after handshaking. I am using ClientWebsocket.

Below is the exception got:

The 'Connection' header value 'upgrade,close' is invalid.

What I have tried:

Core Code as below:

<pre>ClientWebSocket <pre>objwebSocketClient=null;

objwebSocketClient.ConnectAsync(new Uri(uri), CancellationToken.None).Wait();