using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        /*

        Lambda Expression is a shorter way of representing anonymous method.

        Lambda Expression syntax: parameters => body expression

        Lambda Expression can have zero parameter.

        Lambda Expression can have multiple parameters in parenthesis ().

        Lambda Expression can have multiple statements in body expression in curly brackets {}.

        Lambda Expression can be assigned to Func, Action or Predicate delegate.

        Lambda Expression can be invoked in a similar way to delegate.

        */

        // Student collection

        IList<Student> studentList = new List<Student>() { 

                new Student() { StudentID = 1, StudentName = "John", Age = 13} ,

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

                new Student() { StudentID = 3, StudentName = "Bill",  Age = 18 } ,

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

                new Student() { StudentID = 5, StudentName = "Ron" , Age = 15 } 

            };

        Func<Student, bool> isStudentTeenAger = s => s.Age > 12 && s.Age < 20;

        var teenAgerStudents = from s in studentList

                   where isStudentTeenAger(s)

                   select s;

        Console.WriteLine("Teen age Students:");

        foreach(Student std in teenAgerStudents){           

            Console.WriteLine(std.StudentName);

        }

    }

}

​

public class Student{

​

    public int StudentID { get; set; }

    public string StudentName { get; set; }

    public int Age { get; set; }

}