The Program in C# Program to find If Given year is Leap year or not is given below:

using System;

namespace LeapYearCheck
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Codeauri Family,enter a year to check if it is a leap year or not!: ");
            int year = Convert.ToInt32(Console.ReadLine());

            if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
            {
                Console.WriteLine(year + " is a leap year.");
            }
            else
            {
                Console.WriteLine(year + " is not a leap year.");
            }

            Console.ReadLine();
        }
    }
}

Output:

Hello Codeauri Family,enter a year to check if it is a leap year or not!:
2020 is a leap year.

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Here are the step by step execution of above program:

1. The first line “using System;” specifies that the System namespace is being used in this code, which provides access to various classes and methods including Console for input/output.
2. The code defines a namespace named “LeapYearCheck”.
3. Inside the namespace, there is a class named “Program” that contains the main entry point of the code.
4. The Main method of the “Program” class is where the program’s logic starts.
5. The program prompts the user to enter a year using the Console.WriteLine method.
6. The year entered by the user is stored in the “year” variable after being converted from a string to an integer using the Convert.ToInt32 method.
7. The code then checks if the year is a leap year using an if-else statement. A leap year is a year that is divisible by 4 but not by 100, or a year that is divisible by 400.
8. If the year is a leap year, the program outputs a message to the console indicating that it is a leap year. If not, it outputs a message indicating that it is not a leap year.
9. The Console.ReadLine method is called at the end of the Main method to pause the console window and wait for the user to press the Enter key before closing.