John,
It depends on what kind of number you are testing for. If you want any
kind of number, then you can probably use the static TryParse method on the
double type to see if the string is a valid number. If you need integers,
then you will probably want to try the static Parse method on the Int32
(int) type, but you would have to wrap the call in a try/catch block to
catch the exception that is thrown if the number is not the correct format.
You can also call the static IsNumeric method on the Information class
in the Microsoft.VisualBasic namespace in Microsoft.VisualBasic.dll.
Hope this helps.
