What exactly would i put into a secton of C# to cause a website in the persons default browser to be opened?

What exactly would i put into a secton of C# to cause a website in the
persons default browser to be opened?

I don't know the first thing about C#, and I've kinda just dove right in.
I'm a little in over my head here, but as of right now the code i have is
below, And i need to know exactly what to put into that section. Lets say
the website is Google.com what would i type in there to open Google on
what their default browser is set to? I've already tried a multitude of
things on this website, and none of them have been helpful. So please do
me a favor and help me?
private void button 1_Click(object sender, Event Args e);
}