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How can I validate a string to only allow alphanumeric characters in it?

...including non-Latin characters as well. For example, char.IsLetterOrDigit('') will return true. csharppad.com/gist/f96a6062f9f8f4e974f222ce313df8ca – tia Nov 16 '16 at 8:28 ...
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Prevent HTML5 video from being downloaded (right-click saved)?

... It seems still IDM can download it! – PersianMan Jun 24 '18 at 5:42 ...