just use a byte[], see a recommendation from the Author of "Advanced .NET Remoting"
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=OK2sOpRFCHA.2016%40tkmsftngp07
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=OK2sOpRFCHA.2016%40tkmsftngp07
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