in Whidbey DPAPI calls to CryptProtectData and CryptProtectMemory are wrapped in the ProtectedData and ProtectedMemory classes. this is cool! find more info here and here.

If you need to use DPAPI in 1.1. – there are several managed wrappers out there.

A while ago i have written a whole set of tools around CryptProtectData. These include

• A managed wrapper (supports user/machine store and optional entropy)
• A command line and GUI Tool to encrypt and decrypt data
• A single ASPX Page to encrypt and decrypt data

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