How to get the DBContext Class

Question

Hai,

I have installed the new version of EF ver4.1 in my system .. Even though i installed that i didn't get the DBContext Class to inherit to another class please Explain why.. ? And how to get and use that class..

I am trying to create the class like

using System.Data.Entity;

 
publicclass ModelContext : DbContext // But here Dbcontext Class showing error like doen't n't co                                                         ntain the namespace name " DbContext "
  {
}
 

Regards!