using System;

public class Program

{

    public static void Main()

    {

        decimal num = 1345678.89M;

        double num1 = 2222222.50;

        Console.WriteLine(num.ToString("C2"));      

        Console.WriteLine(num.ToString("N2"));

        Console.WriteLine(num1.ToString("C2"));     

        Console.WriteLine(num1.ToString("N2"));

​

    }

}