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1.取得第5筆資料
var fifthAddress = (
from address in addresses.AsEnumerable()
where address.Field<string>("PostalCode") == "M4B 1V7"
select address.Field<string>("AddressLine1"))
.ElementAt(5);
2.取得第一筆資料
DataRow query = (
from contact in contacts.AsEnumerable()
where (string)contact["FirstName"] == "Brooke"
select contact)
.First();
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