using System.Collections.Generic;
public static void Main()
List<student> students = new List<student>
new student(){name="Allen",age=25},
new student(){name="Larry",age=3},
new student(){name="Robert",age=2},
new student(){name="Calire",age=5},
new student(){name="Jack",age=1}
IEnumerable<XElement> scoreQuery =
select new XElement("age", student.age);
foreach (XElement i in scoreQuery)