DataSet 을 Linq로 쿼리하기

DataSet ds = new DataSet();
FillOrders(ds); // this method fills the DataSet from a database

DataTable orders = ds.Tables["SalesOrderHeader"];

var query = from o in orders.ToQueryable()
            where o.Field<bool>("OnlineOrderFlag") == true
            select new { SalesOrderID = o.Field<int>("SalesOrderID"),
                         OrderDate = o.Field<DateTime>("OrderDate") };

foreach(var order in query) {
    Console.WriteLine("{0}\t{1:d}", order.SalesOrderID, order.OrderDate);
}