http://msmvps.com/blogs/peterritchie/archive/2009/04/29/datacontractserializer-readobject-is-easily-confused.aspxWith WCF services you need to declare contracts and generate contract classes that encapsulate those contracts.&#160; Most of the time you can simply let the framework deal with whatever it needs to do to deal with these objects.&#160; Sometimes, youenCommunityServer 2008.5 SP2 (Build: 40407.4157)http://msmvps.com/blogs/peterritchie/archive/2009/04/29/datacontractserializer-readobject-is-easily-confused.aspx#1702590Fri, 17 Jul 2009 13:58:24 GMTd67277c4-116b-43f1-b688-e9ef184ea916:1702590Halo<p>Actually your problem is that you&#39;re calling MemoryStream.GetBuffer() which gets the raw underlying buffer used by the MemoryStream complete with padding. &nbsp;You should be using MemoryStream.ToArray() instead which returns a byte[] that is truncated to the length of the stream. &nbsp;Basically it does what you&#39;re already doing, except that it&#39;s built-in.</p> <div style="clear:both;"></div><img src="http://msmvps.com/aggbug.aspx?PostID=1702590" width="1" height="1">