The WebCaptcha™ control allows you to protect your applications against automated form submissions. It provides everything needed to ensure that the response is not generated by a spam bot and gives the application developer freedom to configure several protection modes.
WebCaptcha supports the following features:
Captcha images, generated automatically
Hidden textbox protection for form submission
Timeout protection
Captcha images, generated from a dictionary
Math-like and logical question-answer captchas, instead of just image
Button to regenerate image, if image is not readable by the end user
Ability to style the image – font color, distortion, level of warping , background color, size
Ability to configure error message and default input box message
Ability to hide default input box and point to another input box on the form that will serve as the validation
Validation error message display
Ability to configure case sensitivity
Ability to configure length of the text
Support for numbers and characters , not only characters
Audio support
Image recognition – instead of using letters/numbers, the captcha can show a well known item and ask the user what it is, or ask the user to select it from a list of items.