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I have a handy utility method which takes code and spits out an in-memory assembly. (It uses CSharpCodeProvider , although I don't think that should matter.) This assembly works like any other with reflection, but when used with the dynamic keyword, it seems to fail with a RuntimeBinderException : 'object' does not contain a definition for 'Sound' Example: var assembly = createAssembly("class Dog { public string Sound() { return \"woof\"; } }"); var type = assembly.GetType("Dog"); Object dog = Activator.CreateInstance(type); var method = type.GetMethod("Sound"); var test1Result = method.Invoke(dog, null); //This returns "woof", as you'd expect dynamic dog2 = dog; String test2Result = dog2.Sound(); //This throws a RuntimeBinderException Does anyone know the reason why the DLR is not able to handle this? Is there anything that could be done to fix this scenario? EDIT: createAssembly method: Disclaimer: some of this stuff contains extension methods, custom types, etc. It should be self-explanatory though. private Assembly createAssembly(String source, IEnumerable<String> assembliesToReference = null) { //Create compiler var codeProvider = new CSharpCodeProvider(); //Set compiler parameters var compilerParameters = new CompilerParameters { GenerateInMemory = true, GenerateExecutable = false, CompilerOptions = "/optimize", }; //Get the name of the current assembly and everything it references if (assembliesToReference == null) { var executingAssembly = Assembly.GetExecutingAssembly(); assembliesToReference = executingAssembly .AsEnumerable() .Concat( executingAssembly .GetReferencedAssemblies() .Select(a => Assembly.Load(a)) )

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