public SingleResult<Customer> Get(int key)
 {
     ResetDataSource();
     var db = new AggregationContext();
     return SingleResult.Create(db.Customers.Where(c => c.Id == key));
 }
 public IQueryable<Customer> Get()
 {
     ResetDataSource();
     var db = new AggregationContext();
     return db.Customers;
 }