class design: jacket adult datafile category honour thread-safety testability


i'm minute an app c# (.net 3.5) i have doubt category design:



i'd emanate category accesses record (read, write) provides the calm users (instanciators) class. many common operation an instance collect certain value file. tangible review (io) operations faily costly i'd keep record information memory let instances opening data. category located an public used several applications simultaniously, i speculation i should worrying thread safety.



how i settlement honour thread-safety unit-testability (for unit-tests, opposite inputfiles contingency used operational code)? any assistance severely appreciated.



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