asp.net - How to Show Captcha images for repeated requests -

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in project, avoid spammers , other security issues, have show captcha image repeated requests same ip address. is, if multiple requests same ip address, captcha should shown check user..

so, task, if 10 requests within 5 seconds same ip, captcha should enabled ip address...

any suggestion highly appreciated..

split task steps, , try think around each step.

if 10 requests within 5 seconds same ip,

1) need identify you're under attack. e.g. see block dos attacks in asp.net

then captcha should enabled ip address...

2) need show captcha. e.g. using captcha prevent bots using asp.net web razor) site

3) need save "validated" ip "white" list.


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