In a response to my recent post on fault injection, Mark asks if I know of any publicly-available fault-injection frameworks.  Yes!  In fact, much of the fault-injection work done at Microsoft is built on top of work done by Microsoft Research, and you can also take advantage of their work.  In particular, look at the Detours tool for injecting code into an existing binary. 

Unfortunately, Detours only does native code, not managed code.  We do have managed code injection tools internally, but I don’t see them on the research site, so I guess they are ‘top secret’.  You are in luck, however; I’ve also heard of a well-known fault-injection tool called Holodeck, that does do managed code.  This also has the advantage of providing a nice user interface and support tools – a point-n-click operation.  Detours is a bit more low-level, and requires some coding and work on your part.  Unfortunately Holodeck does appear to be pretty pricy - $5000 for a single license.  Let’s keep looking…

A google search on fault injection finds a bazillion hits – take a look there and see if you can find a tool that meets your needs.