title: How to key press "CTRL + S " in Selenium Webdriver
body: <p>i have a situation where a pdf file is opened in a browser. Now i need to save the file to my desktop.
  I think the only possibility to save the file is to hit <kbd>Ctrl</kbd> + <kbd>S</kbd>.</p>
  
  <p>Now how do I send the <kbd>Ctrl</kbd> + <kbd>S</kbd> action to my browser.</p>
  
  <p>I need to do this in Selenium Webdriver using c#.</p>