NRules is an open source production rules engine for .NET, based on the Rete matching algorithm. Rules are authored in C# using internal DSL.
First, install NuGet. Then, install NRules from the Package Manager Console:
PM> Install-Package NRules
Use the following resources to get up and running with NRules.
-- Copyright © 2012-2015 Sergiy Nikolayev under the MIT license.