cs 0 Check If Year Is Leap - 2 Methods

/*
    1. Write a program that reads a year from the console and
    checks whether it is a leap. Use DateTime.
    Напишете програма, която прочита от конзолата
    година и проверява дали е високосна.

     In the Gregorian calendar 3 criteria must be taken into
    account to identify leap years:
    -The year is evenly divisible by 4;
    -If the year can be evenly divided by 100, it is NOT a
    leap year, unless;
    -The year is also evenly divisible by 400. Then it is a
    leap year.
*/

using System;
using System.Linq;
using System.Diagnostics;

class CheckIfYearIsLeap
{
    static void Main()
    {
        do
        {
            Stopwatch stopWatch = new Stopwatch();
            //  ----------  Begin:  -----------------------

            Console.Write("\nPlease, Enter a Year: ");
            int year = int.Parse(Console.ReadLine());
            stopWatch.Start();

            Console.WriteLine("\n1. Difines if the Year is Leap using DateTime.IsLeapYear:\n");
            DateTimeIsLeapYear(year);

            Console.WriteLine("\n2. Difines if the Year is Leap using Leap-Criteria: \n");
            CreteriaDefinitionOfLeap(year);

            // -------   end: -----------------------------
            stopWatch.Stop();
            Console.WriteLine("\n\n\nRuntime: {0}", stopWatch.Elapsed);
        } while (EndMethod() == -1);
    }
    //=============== METHODS: ====================

    // Difines if the Year is Leap using DateTime.IsLeapYear:
    static void DateTimeIsLeapYear(int year)
    {
        if (DateTime.IsLeapYear(year))
        {
            Console.WriteLine("\nThe year is leap.\n");
        }
        else
        {
            Console.WriteLine("\nThe year is not leap.\n");
        }
    }

    // Difines if the Year is Leap by Leap Criteria:
    static void CreteriaDefinitionOfLeap(int year)
    {
        if (year % 100 == 0)
            if (year % 400 == 0)
                Console.WriteLine("\nThe Year is Leap");
            else
                Console.WriteLine("\nThe Year is NOT Leap");
        else if (year % 4 == 0)
            Console.WriteLine("\nThe Year is Leap");
        else
            Console.WriteLine("\nThe Year is NOT Leap");
    }

    // ------------ End Method: ------------------------
    static int EndMethod()
    {
        Console.ForegroundColor = ConsoleColor.DarkRed;
        Console.Write("\nPress Any Key to Exit or press \"c\" to continue");
        Console.ResetColor();
        ConsoleKeyInfo key = Console.ReadKey();
        if (key.KeyChar == 'c')
        {
            Console.Clear();
            return -1;
        }
        else
        {
            Environment.Exit(0);
            return 0;
        }
    }
}