using System;

using System.Linq;

public class Student

{

    public int StudentID { get; set; }

    public String StudentName { get; set; }

    public int Age { get; set; }

}

​

public class Program

{

    public static void Main(string[] args)

    {

        Student[] studentArray = { 

                    new Student() { StudentID = 1, StudentName = "John", Age = 18 } ,

                    new Student() { StudentID = 2, StudentName = "Steve",  Age = 21 } ,

                    new Student() { StudentID = 3, StudentName = "Bill",  Age = 25 } ,

                    new Student() { StudentID = 4, StudentName = "Ram" , Age = 20 } ,

                    new Student() { StudentID = 5, StudentName = "Ron" , Age = 31 } ,

                    new Student() { StudentID = 6, StudentName = "Chris",  Age = 17 } ,

                    new Student() { StudentID = 7, StudentName = "Rob", Age = 19  } ,

                };

​

        // Use LINQ to find teenager students

        Student[] teenAgerStudents = studentArray.Where(s => s.Age > 12 && s.Age < 20).ToArray();

        // Use LINQ to find first student whose name is Bill 

        Student bill = studentArray.Where(s => s.StudentName == "Bill").FirstOrDefault();

        // Use LINQ to find student whose StudentID is 5

        Student student5 = studentArray.Where(s => s.StudentID == 5).FirstOrDefault();

    }

}