Nikon70 1 Newbie Poster

Hi,

I've been at this for an hour and feel it's time to give up and ask you guys.

I've got a data grid view. I can hold down CTRL+MouseClick and multiselect my rows.
How do I do the same with key strokes?
I basically want to use the arrow keys to move up and down the grid, then hit the Space Bar to add the current row to the multiple selected rows.

Thanks in advance,
Gary