How to call Stored Procedures with EntityFramework?

One way is to use the Database property off the DbContext:

SqlParameter param1 = new SqlParameter("@firstName", "Frank");
SqlParameter  param2 = new SqlParameter("@lastName", "Borland");
context.Database.ExecuteSqlCommand("sp_MyStoredProc @firstName, @lastName", 
                              param1, param2);

EF5 definitely supports that.