The Program in  C# Program to Calculate Factorial of Given Number is given below:

using System;

namespace FactorialCalculator
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello Codeauri Family, enter a number here to calculate its factorial: ");
            int number = int.Parse(Console.ReadLine());
            int result = 1;

            for (int i = 1; i <= number; i++)
            {
                result *= i;
            }

            Console.WriteLine("Okay, the factorial of " + number + " is " + result);
            Console.ReadLine();
        }
    }
}

Output:

Hello Codeauri Family, enter a number here to calculate its factorial: 5
Okay, the factorial of 5 is 120

Pro-Tips💡

Here are the step by step execution of above program:

1. The code starts by using the System namespace which provides access to various functionalities including input/output operations through the Console class.
2. The code defines a namespace named “FactorialCalculator”.
3. The code defines a class named “Program” within the namespace.
4. The Main method is defined within the Program class, which is the entry point of the program.
5. The code displays a message asking the user to enter a number.
6. The entered value is read as a string, parsed into an integer, and stored in the “number” variable.
7. The “result” variable is initialized to 1.
8. A for loop starts from 1 and goes until “number”. In each iteration, the value of “result” is multiplied by the loop counter “i”.
9. After the loop, the code displays the result by writing a message to the Console.
10. The Console.ReadLine() method is called at the end of the Main method to prevent the program from terminating immediately after printing the result.