Calculate the Factorial of an Integer in C#

private void button1_Click(object sender, EventArgs e)
{
    int inputValue;
    if (int.TryParse(this.textBox1.Text, out inputValue) && inputValue > 0)
    {
        BigInteger bigInt = 1;
        while (inputValue > 1)
        {
            bigInt = BigInteger.Multiply(inputValue--, bigInt);
        }
        label1.Text = bigInt.ToString();
        label2.Text = bigInt.ToString().Length + " Digits";

    }
    else
    {
        label1.Text = "Invalid Input";
        label2.Text = "";
    }
}

As Senior Architect, Matthew is responsible for the Architecture, Design, and Coding of the CodeProject software as well as Manager of the Infrastructure that runs the web site.

Matthew works on improving the performance and experience of the Code Project site for users, clients, and administrators.

Matthew has more years of software development, QA and architecture experience under his belt than he likes to admit. He graduated from the University of Waterloo with a B.Sc. in Electrical Engineering. He started out developing micro-processor based hardware and software including compilers and operating systems.
His current focus is on .NET web development including jQuery, Webforms, MVC, AJAX, and patterns and practices for creating better websites.
He is the author of the Munq IOC, the fastest ASP.NET focused IOC Container.
His non-programming passions include golf, pool, curling, reading and building stuff for the house.