How to represent linear types in C#/.Net?

Is there a reasonable way to express the concept of a linear type in .Net (Compact Framework/desktop 3.5 common subset), in such a way that (a) the required syntax doesn't become overly verbose, convoluted, or otherwise painful and (b) the invariant can be either enforced at run time or validated by code analysis at compile time (so a maintenance programmer in an all-fired hurry can't just blithely ignore the invariant)? The idea here is to avoid the need for defensive copying of command objects at subsystem boundaries.