bundling C-u C-space

[Tim Johnson]

Using GNU Emacs 24.3.1 on ubuntu 14.04

I'd like to get the functionality of Control-u Control-space in one
keystroke (for instance, Control-,) but can't wrap my thoughts about
how to put that in a lambda or use-defined function.

Because the larger question is about how to automate
'universal-argument, I'm sure the solution would edify me above and
beyond this simple need.

Pointers to docs and examples may be sufficient.

thanks
-- 
Tim 
http://www.akwebsoft.com, http://www.tj49.com