Excel Financial Functions for .NET
Thisis a .NET library that provides the full set of financial functionsfrom Excel. The main goal for the library is compatibility with Excel,by providing the same functions, with the same behaviour. Note thoughthat this is not a wrapper over the Excel library; the functions havebeen re-implemented in managed code so that you do not need to haveExcel installed to use this library.
Go to http://code.msdn.microsoft.com/FinancialFunctions
See also these related projects.