Add reference to System.Core.
Add reference to System.Core.

rockfordlhotka/csla,BrettJaner/csla,jonnybee/csla,JasonBock/csla,jonnybee/csla,BrettJaner/csla,ronnymgm/csla-light,BrettJaner/csla,jonnybee/csla,JasonBock/csla,rockfordlhotka/csla,MarimerLLC/csla,MarimerLLC/csla,JasonBock/csla,rockfordlhotka/csla,MarimerLLC/csla,ronnymgm/csla-light,ronnymgm/csla-light