How to check a year is leap year or not using switch case in c#.?

using System;
class abc
{
    int year;
    bool a;
    public void fun()
    {
        Console.WriteLine("Enter the year it is leap year or not");
        year = Convert.ToInt32(Console.ReadLine());
        switch (a = (year % 4 == 0))
        {
            case true:
                Console.WriteLine("The year is leap year");
                break;
            case false:
                Console.WriteLine("The year is not leap year");
                break;
        }
        Console.ReadKey();
    }
}
class leaps
{
    public static void Main(string[] args)
    {
        abc a = new abc();
        a.fun();
    }
}
Output