Where do I get Microsoft.GroupPolicy.Management.dll?

Having a look at this code http://msdn.microsoft.com/en-us/library/ee862406%28VS.85%29.aspx

It says "Add the Microsoft.GroupPolicy.Management assembly to your project" but i cant seem to find out w开发者_如何学编程here to get Microsoft.GroupPolicy.Management from.

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Instructions here: http://msdn.microsoft.com/en-us/library/ff182374%28v=VS.85%29.aspx