collection classes are not accessible from WCF service project to Application project

Dear All, i am working in a project having WCF and Asp.net application projects i was working in VS 2010. i used entityspaces that generates my table classes that i am using for database querying. i used collection classes [like all employees record] and single classes [single employee record] in WCF project and declare its signature in IService.cs with Service.svc i then add it in service reference in my project. and also used these classes in a class in my application. everything was working fine. i then installed VS 2012 for some reason. now when i opened my project even in VS 2010 and locate Service reference by selecting [view all files in solution explorer] i can see all collection and class declaration [any methods i declared with either collection or single entity return type] and i can access any of these in my application class. even i can see all these methods in Referece.cs (present under my service ...