Selenium WebDriver how to close browser popup

Question

I am writing tests for a web App using selenium webDriver and came across a scenario where when I try to close the browser I get a popup saying \"Are you sure? The page is a

Answer 1

IAlert alert = driver.SwitchTo().Alert();

alert.Accept(); //for two buttons, choose the affirmative one
// or
alert.Dismiss(); //to cancel the affirmative decision, i.e., pop up will be dismissed and no action will take place