The Program in  C# Program to Check If Given Number is perfect number or not is given below:

using System;

namespace PerfectNumber
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Codeauri Family, enter a number to check if it is a perfect number:");
            int n = int.Parse(Console.ReadLine());

            int sum = 0;
            for (int i = 1; i < n; i++)
            {
                if (n % i == 0)
                {
                    sum += i;
                }
            }

            if (sum == n)
            {
                Console.WriteLine("Yes, " + n + " is a perfect number.");
            }
            else
            {
                Console.WriteLine("No, " + n + " is not a perfect number.");
            }

            Console.ReadLine();
        }
    }
}

Output:

Hello Codeauri Family, enter a number to check if it is a perfect number:
28
Yes, 28 is a perfect number.

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Here are the step by step execution of above program:

1. The code starts by importing the System namespace.
2. The program defines a Program class with a Main method that takes an array of strings as arguments (string[] args).
3. In the Main method, the program prompts the user to enter a number. The number is then stored in the n variable.
4. The program uses a for loop to iterate from 1 to n - 1. For each iteration, the program checks if the current iteration number (i) is a factor of n (n % i == 0).
5. If the current iteration number is a factor of n, the program adds it to the sum variable.
6. After the loop, the program checks if sum is equal to n.
7. If sum is equal to n, the program prints a message indicating that n is a perfect number.
8. If sum is not equal to n, the program prints a message indicating that n is not a perfect number.
9. The program ends with a ReadLine method call, which waits for the user to press Enter before closing the program.