how to convert string to code in c#

I saw there is such question in c++ I am a very begginer and I need a very simple example how to do it . the user writes code in the text box and what I need o do is to execute it how???

From stackoverflow

• Please see http://stackoverflow.com/questions/4629/c-eval-equivalent.

• You can use the classes in the System.CodeDom namespace to compile C# into in-memory assemblies, and run them on the fly. Here is a mini-tutorial.

  Alternatively, you can use Reflection.Emit to construct code on the fly.

• Check the approach used in this example.