I was wondering how to send spacebar key
using SendKeys.send();
It works with the other keys but only the spacebar !!
Here is the link where I found the other keys http://msdn.microsoft.com/en-us/library/system.windows.forms.sendkeys.aspx
Per the documentation you linked, SendKeys.send(" ");
will send a space key.
The only keys which require special codes are "characters that aren't displayed when you press a key".