isblank vs. isnull

[Bill Reestman <bjr40@HOTMAIL.COM>]

Can someone tell me the difference between a null string and null.

Isblank checks if source_val is an empty string, null string, or composed
entirely of whitespace characters.

Isnull checks if source_val is null.

I was under the impression that isblank was just a more robust version of
isnull, but when I tested this, isblank doesn't seem to treat a null value
in the database as I thought it would.

Thanks in advance for any help,
Bill
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