using System;

​

public class invalidAge:Exception

{

public invalidAge(String msg):base(msg)

{

}

}

​

​

​

public class Program

{

    static void checkage (int age)

    {

    if (age<18)

    {

    throw new invalidAge("not eligible to vote");

    }   

        else

        {

        Console.WriteLine("Eligible to vote");

        }

    }

    public static void Main()

    {

        try

        {

            checkage(80);

        }

        catch(invalidAge e)

        {Console.WriteLine(e);}

    }

    }

​