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How can I have Captcha image verification using asp.net forms?
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Create reCaptcha account or login to the existing account. Register a new site and add your site domain to the list of domains. If you want to test the template in JSFiddle, please also add jsfiddle.net to the list. Follow the "client-side integration" instructions as specified in the reCaptcha dashboard.
A CAPTCHA test is made up of two simple parts: a randomly generated sequence of letters and/or numbers that appear as a distorted image, and a text box. To pass a the test and prove your human identity, simply type the characters you see in the image into the text box. Why does Google use CAPTCHA?
Captcha Verification (or Completely Automated Public Turing Test to tell Computers and Humans Apart) is a common web technique used to help ensure that your respondents are real humans and not a program written to spam your survey. The respondent is asked to check a box to prove that they are human.
A couple of things to look at:
That was after a couple of minutes of searching - I'm sure you can find more.
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I have used this one first: http://www.codeproject.com/KB/custom-controls/CaptchaControl.aspx
But I've had massive spam problems by bots. Using ReCaptcha works perfect so far.
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