[Modify] Throw exception
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@ -696,7 +696,11 @@ namespace WebSocketSharp.Server
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/// </param>
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protected void SendAsync (Stream stream, int length, Action<bool> completed)
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{
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if (_websocket != null)
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if (_websocket == null) {
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var msg = "The current state of the connection is not Open.";
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throw new InvalidOperationException (msg);
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}
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_websocket.SendAsync (stream, length, completed);
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}
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