Hi,
You can use a RetrieveVersionRequest to get the build number of the connected CRM.
var response = (RetrieveVersionResponse)service.Execute(new RetrieveVersionRequest());
var crmversion = response.Version;
CRM 2011 = Major Version 5
CRM 2013 = Major Version 6
Link: CRM build numbers
steve
Steve Sämmang, Vienna, Austria
Blog: xrm.io Website: simplic.at