using System;
using System.CodeDom.Compiler;
using System.IO;
using System.Reflection;

namespace EvalInDomain
{
  class Program
  {

    static string sourceCode =
@"
using System;
namespace TestNameSpace
{
  public class TestClass : MarshalByRefObject 
  {
     public void TestMethod()
     {
        Console.WriteLine(""Hello, AppDomain \""{0}\""!"", 
          AppDomain.CurrentDomain.FriendlyName);
     }
  }
}";
    static void Main()
    {
      CodeDomProvider compiler = CodeDomProvider.CreateProvider("CSharp");
      string DllDir = AppDomain.CurrentDomain.BaseDirectory;
      string tmpDllName = Path.Combine(DllDir,Guid.NewGuid().ToString()) + ".dll";
      CompilerParameters compilerParameters = new CompilerParameters()
      {
        CompilerOptions = "/t:library", 
        OutputAssembly = tmpDllName, 
        GenerateInMemory = true, 
      };
      CompilerResults results = compiler.CompileAssemblyFromSource(compilerParameters, sourceCode);
      AppDomainSetup ads = new AppDomainSetup() { ApplicationBase = Path.GetDirectoryName(tmpDllName)  };
      AppDomain newDomain = AppDomain.CreateDomain("Another Domain", null, ads);
      object instance = newDomain.CreateInstanceAndUnwrap(results.CompiledAssembly.FullName, "TestNameSpace.TestClass");
      Type objectType = instance.GetType(); 
      MethodInfo mi = objectType.GetMethod("TestMethod"); 
      mi.Invoke(instance,null);
      AppDomain.Unload(newDomain);
      //Пытаемся прибрать мусор:
      File.Delete(tmpDllName); //Ошибка (файл занят)...
      //
      Console.Write("Press any key to exit... ");
      Console.ReadKey(false);
    }
  }
}

echo off
set JSFile=JSMath
set JSCompiler=C:\Windows\Microsoft.NET\Framework\v4.0.30319\jsc.exe

del %JSFile%.dll

echo class JsMath > %JSFile%.js
echo { >> %JSFile%.js
echo   static function Eval(expression : String, x : double) : double >> %JSFile%.js
echo   { >> %JSFile%.js
echo     with (Math) { >> %JSFile%.js
echo        return eval(expression); >> %JSFile%.js
echo     } >> %JSFile%.js
echo   }; >> %JSFile%.js
echo } >> %JSFile%.js

%JSCompiler% /t:library %JSFile%.js
del %JSFile%.js