C# Eval method

Eval.cs

private static object Eval(string __code)
{
    var csc = new CSharpCodeProvider(new Dictionary<string, string>() { { "CompilerVersion", "v3.5" } });
    var p   = new CompilerParameters(new[] { "mscorlib.dll", "System.Core.dll" }, null, true);
    p.GenerateInMemory = true; 
    p.GenerateExecutable = false;
    CompilerResults r = csc.CompileAssemblyFromSource(p, "using System; class p {public static object c(){"+__code+"}}");
    if (r.Errors.Count > 0) 
    { 
      r.Errors.Cast<CompilerError>().ToList().ForEach(error => Console.WriteLine(error.ErrorText)); 
      return null; 
    }
    System.Reflection.Assembly  a = r.CompiledAssembly;
    MethodInfo                  o = a.CreateInstance("p").GetType().GetMethod("c");
    return                      o.Invoke(o, null);
}