This seems to be a hot topic regarding c# ^^
I found two pages which show different approaches :
(evaluation at runtime but sure this would be damn much work to implement, because of the sheer amount of commands)
http://www.codeproject.com/KB/cs/runtime_eval.aspx

and
(compiling at runtime)
http://www.digitalcoding.com/Code-Snippe...e-run-time.html

@ventilator for sure ! delegates are maybe the most interesting part of the wrapper, as one has to keep the references of a delegate until it isn't used anymore ^^