Is it possible to set class as Dbcontext so that we can read from class and DB

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MVC4

IN EF , Is it possible to Connect Both database and ClassFile With Data.

How we can read Data from Class File. I want to pass context so that which one need to connect will be known.

private List<ItemList>GetDefaultCategory(ISampleDataDB dbContext)
        {
            List<ItemList> Result = new List<ItemList>();
            Result = (from p in dbContext.Item
                      where p.HouseID.Equals(1) && p.ItemorCategory.Equals(2)
                      select new ItemList { ItemId = p.ItemID, ItemCode = p.Name }).AsQueryable().ToList<ItemList>();

            return Result;
        }

Here iSampledataDb is an interface with properties . I want to use the same method by passing object of DbContext(Entity Framework)

TestContext dbContext = new TestContext();

GetDefaultCategory(dbContext);

Is it possible or any other alternative is available