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Add Date: 04/09/2012 captcha control is a web user control which can be placed easily on any web page of .aspx by drag and drop. This web control is composite control and encapsulates the captcha image, a textbox for capturing the result and verifying the correct code was entered.

You can see the live demo here: Captcha Control

The image is generated by the CAPTCHA class. When click of refresh button,a new CAPTCHA image will be generated.

The CAPTCHA image is generated by CaptchaHandler and random code is generated to display with image. This code is stored on session variable and would be verified against entered textbox value while submitting form.

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