Determines whether expression can be
evaluated as a number.
Rules at a Glance
If the expression passed to IsNumeric evaluates
to a number, True is returned; otherwise,
IsNumeric returns False.
Programming Tips and Gotchas
If expression is a date or time,
IsNumeric evaluates to False.
If expression is a currency value,
including a string that includes the currency symbol defined by the
Control Panel's Regional Settings applet,
IsNumeric evaluates to
True.