using System;

public class Program

{

    public static void Main()

    {

        Student std = new Student();

        std.Age = -10;

        Console.WriteLine(std.Age);

        std.Age = 10;

        Console.WriteLine(std.Age);

    }

}

class Student

{

    private int age;

    public int Age

    {

    get

    {

    return age;

    }

    set

    {

        if(value>0)

        {

            age = value;

        }

        else

        {

            Console.WriteLine("You have entered an invalid value please try again");

        }

    }

}

​

}