How do I strip non-alphanumeric characters (including spaces) from a string?

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In your regex, you have excluded the spaces from being matched (and you haven’t used Regex.Replace() which I had overlooked completely…):

result = Regex.Replace("Hello there(hello#)", @"[^A-Za-z0-9]+", "");

should work. The + makes the regex a bit more efficient by matching more than one consecutive non-alphanumeric character at once instead of one by one.

If you want to keep non-ASCII letters/digits, too, use the following regex:

@"[^\p{L}\p{N}]+"

which leaves

BonjourmesélèvesGutenMorgenliebeSchüler

instead of

BonjourmeslvesGutenMorgenliebeSchler

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