Looking for simple rules-engine library in .NET

class Rule
{
Expression Exp;
Actions[] Actions;
Run() { if(Exp.Evaluate()) { foreach(action in Actions) { action.Execute() ; } } }
}

String result = ExpressionEvaluator.EvaluateToString("(2+5) < 8");

using System;
using System.CodeDom.Compiler;
using System.Globalization;
using System.Reflection;
using Microsoft.JScript;

namespace Common.Rule
{
  internal static class ExpressionEvaluator
  {
    #region static members
    private static object _evaluator = GetEvaluator();
    private static Type _evaluatorType;
    private const string _evaluatorSourceCode =
        @"package Evaluator
            {
               class Evaluator
               {
                  public function Eval(expr : String) : String
                  {
                     return eval(expr);
                  }
               }
            }";

    #endregion

    #region static methods
    private static object GetEvaluator()
    {
      CompilerParameters parameters;
      parameters = new CompilerParameters();
      parameters.GenerateInMemory = true;

      JScriptCodeProvider jp = new JScriptCodeProvider();
      CompilerResults results = jp.CompileAssemblyFromSource(parameters, _evaluatorSourceCode);

      Assembly assembly = results.CompiledAssembly;
      _evaluatorType = assembly.GetType("Evaluator.Evaluator");

      return Activator.CreateInstance(_evaluatorType);
    }

    /// <summary>
    /// Executes the passed JScript Statement and returns the string representation of the result
    /// </summary>
    /// <param name="statement">A JScript statement to execute</param>
    /// <returns>The string representation of the result of evaluating the passed statement</returns>
    public static string EvaluateToString(string statement)
    {
      object o = EvaluateToObject(statement);
      return o.ToString();
    }

    /// <summary>
    /// Executes the passed JScript Statement and returns the result
    /// </summary>
    /// <param name="statement">A JScript statement to execute</param>
    /// <returns>The result of evaluating the passed statement</returns>
    public static object EvaluateToObject(string statement)
    {
      lock (_evaluator)
      {
        return _evaluatorType.InvokeMember(
                    "Eval",
                    BindingFlags.InvokeMethod,
                    null,
                    _evaluator,
                    new object[] { statement },
                    CultureInfo.CurrentCulture
                 );
      }
    }
    #endregion
  }
}

BUSINESS RULES IN NATURAL LANGUAGE

Before
If (Customer.Age > 50 && Customer.Status == Status.Active) {
policy.SetDiscount(true, 10%);
}

After (with Smart Rules)
If Customer is older than 50 and
the Customer Status is Active Then
Apply 10 % of Discount