Identify if a string is a number

Question

If I have these strings:

1. \"abc\" = false

2. \"123\" = true

3. \"ab2\"

Answer 1

You can also use:

stringTest.All(char.IsDigit);

It will return true for all Numeric Digits (not float) and false if input string is any sort of alphanumeric.

Please note: stringTest should not be an empty string as this would pass the test of being numeric.