c# - fighting spam bots -

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i have c# form in site , want prevent spam bots filling it. trick is, want avoid captha or other user input avoid loosing single registration.

here techniques have in mind:

  1. hidden input field (question: still effective?)
  2. track time, since first user input (focus on firstname) till posting form.. humans take more 3 seconds complete form (even auto-fill), bots take second or less fill in registration , post it. (question: if start timer first user input, when should stop it?)
  3. put in form tag fake post url, or post form itself, , on submit button click action add real post url javascript. (question: wonder if new spam bots can cheat this?)

i glad hear other techniques adopt, again, without using captcha, spam filters, form verifications , validation. thank you

would have sort of flash asks reconnect dots (so interactive , doesnt require typing), , when user correctly, can post submit check.

never liked captcha, wierd ones humans have problem intepreting :)


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