IQFeed.CSharpApiClient
                                
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                        Exception happens on ReqWatchList call
Calling ReqWatchList produces exceptions:
Unhandled exception. [System.ArgumentException: Offset and length were out of bounds for the array or count is greater than the number of elements from index to the end of the source collection.
   at System.IO.MemoryStream.Read(Byte[] buffer, Int32 offset, Int32 count)
   at IQFeed.CSharpApiClient.Socket.SocketMessageHandler.TryRead(Byte[]& output) 
It happens when there are a lot of symbols. I tried 1300 options symbols. After some debugging, I figured out that the size of the buffer is not enough.
Increasing _readBytes solves the issue, quick fix:
  _readBytes = new byte[bufferSize * 3];
@sharok thanks for rising this. could you please refresh my mind on what it does exactly? just returns a list of currently watched symbols?
usually I give the opportunity to increase the buffer size through the factory. Let me add that as well for Level1
@mathpaquette Yes, it just returns watching symbols.