I looked for a while over the net for a way to easily calculate a factorial value (n!), but nothing was helping and I saw some VERY long and drawn out solutions. Well, it wasn't that hard after I thought about it for a while and this was the easiest solution I could come up with. I hope it helps!

The code below is what I put in my event handler. The comment lists my class variables used.

int Factorial(int input)
{
int answer = 0;
if (input > 0)
{
count = 1;
while (count <= input)
{
if (count == 1)
{
answer= 1;
count++;
}
else
{
answer = count * answer;
count++;
}
}
}
else
{
MessageBox.Show("Please enter only a positive integer.");
}
return answer;
}