Calculate factorial in C# using recursion
<p>I know how to calculate a factorial using a loop. Below is the code for loop, but I am getting an error while doing it by recursion. Below are both the code samples. How can I fix this?</p>

<pre><code>namespace factorial
{
    class Program
    {
        static void Main(string[] args)
        {
            int i, number, fact;
            Console.WriteLine("Enter the Number");
            number = int.Parse(Console.ReadLine());
            fact = number;
            for (i = number - 1; i &gt;= 1; i--)
            {
                fact = fact * i;
            }
            Console.WriteLine("\nFactorial of Given Number is: "+fact);
            Console.ReadLine();
        }
    }
}
</code></pre>

<p>Factorial using recursion:</p>

<p>Is there something as where I am going wrong? When am I calculating it using recursion?</p>

<p>Factorial using loop:</p>

<pre><code>public double factorial_Recursion(int number)
{
    if (number == 1)
        return 1;
    else
        return number * factorial_recursion(number - 1);
}

public double factorial_WhileLoop(int number)
{
    double result = 1;
    while (number != 1)
    {
        result = result * number;
    }
    return result;
}
</code></pre>