How do I calculate power-of in C#?

Question

I\'m not that great with maths and C# doesn\'t seem to provide a power-of function so I was wondering if anyone knows how I would run a calculation like this:

Answer 1

Do not use Math.Pow

When i use

for (int i = 0; i < 10e7; i++)
{
    var x3 = x * x * x;
    var y3 = y * y * y;
}

It only takes 230 ms whereas the following takes incredible 7050 ms:

for (int i = 0; i < 10e7; i++)
{
    var x3 = Math.Pow(x, 3);
    var y3 = Math.Pow(x, 3);
}