Why do I get the wrong results?

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C#

I've written a C# program to calculate the total of the money invested at different amounts of interest rates.

Compound interest formula I'm using: P (1 + r )n

I cant see what I'm doing wrong.

For example:
Amount: 100
Rate: 10
years: 5
With a calculator the answer is 161.05

But once I do it with my program it calculates to 100.00001

Your help is much appreciated.

What I have tried:

double amount;
     double rate;
     double years;
     double total;
     amount = Convert.ToDouble(textBox1.Text);
     rate = Convert.ToDouble(textBox2.Text);
     years = Convert.ToDouble(textBox3.Text);

     rate = rate / 100;

     total = amount * 1 + Math.Pow(rate, years);

     label1.Text = total.ToString();