Modifying the EF Model and Creating New Objects at Run Time

I use EF4 in the model (first DB), POCO in objects, ASP.Net in the user interface. Of course I have a Biz level. I need to create a dynamic form generator. I decided to create a table from forms created by users, and then update my EF model at runtime, generate POCO objects and biz logic at runtime, and then compile them at runtime.

I have a problem updating the model at runtime. any help?

Thanks in advance -Hamid