How do I code a file/folder/DB "change detection" monitor in .NET framework?

I must program an application system containing workflows that will require "change detector" triggers in order to set workflow events in motion, so I must create monitors that will keep watch for changes in files, folder contents, and database tables.

This system is part of a commercial application that will exist on both J2EE and .NET platforms.

I've never done this kind of "change detection" monitor. Can someone describe how to approach it, or point me toward a tutorial or resource that would shed some light?
ERP_CodeWarriorAsked:
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