I am using Generic repository to wrap DbContext and DbSet classes from upper level. However, when in certain queries I need to use \".Include()\" method to include navigation pr
Include for IQueryable is an extension method that is implemented in namespace System.Data.Entity in the assembly EntityFramework.dll. So your project must reference this assembly and you must add
using System.Data.Entity;
at the beginning of your code file. It will make the string and lambda based version of Include available, so that you can use:
orderQuery.Include("Customer")
or
orderQuery.Include(o => o.Customer)