Question

I’ve looked all over the place, but it seems that examples I have seen allow only numbers 0-9

I’m writing a Pythagorean Theorem program. I wish to have the phone (Windows Phone 7) check if there are ANY alpha (A-Z, a-z), symbols (@,%), or anything other than a number in the textbox. If not, then it will continue computing. I want to check so there will be no future errors.

This is basically a bad pseudocode of what I want it to do

txtOne–>any alpha?–No–>any symbols–No–>continue…

I would actually prefer a command to check if the string is completely a number.

Thanks in advance!

Answer 1

There are several ways to do this:

1. You can use TryParse() and check if the return value is not false.

2. You can use Regex to validate:

   Match match = Regex.Match(textBox.Text, @"^\d+$");
   if (match.Success) { ... }
   // or
   if (Regex.IsMatch(textBox.Text, @"^\d+$")) { ... }