Calculates the factorial of a given non-negative integer using a recursive approach.

CalculateFactorial.cs

/// <summary>
/// Calculates the factorial of a given non-negative integer using a recursive approach.
/// </summary>
/// <param name="number">The non-negative integer for which the factorial is to be calculated.</param>
/// <returns>The factorial of the given number.</returns>
/// <exception cref="ArgumentException">Thrown when the provided number is negative.</exception>
public static int CalculateFactorial(int number)
{
    if (number < 0)
    {
        throw new ArgumentException("Number must be a non-negative integer.");
    }

    if (number == 0 || number == 1) 
    {
        return 1;
    }

    return number * CalculateFactorial(number - 1);
}