send "spacebar key" using SendKeys.sendwait()

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".

A normal space with double quotes works SendKeys.SendWait(" ")

...but if you are sending characters as Char instead of String as the arguments make sure to replace the Char space with a String space.

if (chr == ' ')
{
    SendKeys.SendWait(" ");
}else{
    SendKeys.SendWait("{"+chr+"}");
}

Use application.sendkeys "{SPACE}"