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By using HttpRequestValidationException, does it necessarily protect you against all cross-scripting threats?
Are there situations where a potentially dangerous script might manage to go undetected?
No, in short it doesn’t. Please decompile it using reflector and see what it does. An attack on an html attribute could be: ” onfocus=alert(1) autofocus
There are no < or > in this yet it still works. Please use AntiXss and check the OWASP XSS prevention cheat sheet. So you need to pay attention especially whenever you are using unescaped attributes like Literal.