using CryptUnprotectData api from c#

Hi,

i'm trying to use function from crypt32.dll in dot net, and get exception:

An unhandled exception of type 'System.TypeLoadException' occurred in
WindowsApplication1.exe

Additional information: Could not load type WinApis from assembly
WindowsApplication1, Version=1.0.2006.19524, Culture=neutral,
PublicKeyToken=null because the method CryptUnprotectData has no RVA.


can anyone shade some light on the subject?

TIA, z.




.

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