Check string for invalid characters? Smartest way?

You can use a regular expression for this:

Regex r = new Regex("[^A-Z0-9.$ ]$");
if (r.IsMatch(SomeString)) {
    // validation failed
}

To create a list of characters from A-Z or 0-9 you would use a simple loop:

for (char c = 'A'; c <= 'Z'; c++) {
    // c or c.ToString() depending on what you need
}

But you don't need that with the Regex - pretty much every regex engine understands the range syntax (A-Z).

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