Service Factory Issuehttp://developers.de/blogs/damir_dobric/archive/2008/01/29/service-factory-issue.aspxWhen you create a Data Contract with number of primitive properties, be sure that the name of the property is never "Value". Following example shows a Data Contract which you should not use: In this case the Data Contract generator would createenCommunityServer 2008 SP1 (Build: 30619.63)