Write a C# Sharp program to find whether a given year is a leap year or not

using System;  
public class Exercise4  
{  
    public static void Main() 
{
    int chk_year;
    Console.Write("\n\n");
    Console.Write("Check whether a given year is leap year or not:\n");
    Console.Write("----------------------------------------------");
    Console.Write("\n\n");
    Console.Write("Input an year : ");
    chk_year= Convert.ToInt32(Console.ReadLine());
 
    if ((chk_year % 400) == 0)
 Console.WriteLine("{0} is a leap year.\n", chk_year);
    else if ((chk_year % 100) == 0)
 Console.WriteLine("{0} is not a leap year.\n", chk_year);
    else if ((chk_year % 4) == 0)
 Console.WriteLine("{0} is a leap year.\n", chk_year);
    else
 Console.WriteLine("{0} is not a leap year.\n", chk_year);
}
}