I'am making a program that auto refresh a link, every 5 sec.

Start (button1)
Stop (button2)
Webbrowser (webbrowser1)
Textbox (textbox1)

So people write the link in the textbox. And then they press "Start"
And then the program refresh the link every 5 sec. If they click on "stop", then the refreshing stops.
But I dont know how I can make it...
Shoul i add a timer?

_
"Start" code:
WebBrowser1.Navigate (TextBox.Text)
But how can I do like it gets refreshed every 5 sec?

And how do I stop the refreshing with the "Stop" button?