# Use the .NET Implementation of the API

The .NET version of the Filter API provides an interface to the core functionality of the C API. It contains one primary class (`Filter`) that wraps the filter functionality of the C API. It is implemented in the namespace `Autonomy.API.Filter` contained in the file `FilterDotNet.dll`. The library is in the directory `install\OS\bin`, where `install` is the path name of the Filter installation directory and `OS` is the name of the operating system.

For more information on the .NET API, see the .NET help file `FilterDotNetHelp.chm` in the directory `install\dotnetapi\dotnethelp`.

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