Type in text in image

[Allan Ebdrup]

I'm coding a website in C# dotNet 2.0, and I need a freeware component for
asking the user to type in the text you see in an image.
As a security for that is is indeed a real user that's accessing the page
and not a robot.
Does anyone know if there is such a component available anywhere?
What is the name of this functionality?

Kind Regards,
Allan Ebdrup

[Marc Gravell]

Name is captcha: http://en.wikipedia.org/wiki/Captcha

For components, google:
http://www.google.co.uk/search?hl=en...e+.net+captcha

Note, however, that many robots are now better than humans at reading them
;-p

Marc

[Marc Gravell]

(note in particular the points on accessibility on wiki)

Marc

[samuelhon]

For a slighting different approach, have a look here

http://blogs.crankygoblin.com/blogs/...n-Gaptcha.aspx

Guess it depends on your target market

[Walter Wang [MSFT]]

Hi Allan,

As Marc and samuelhon replied, it's called CAPTCHA. You may find following
two examples of .NET components:
#CAPTCHA Image - The Code Project - ASP.NET
http://www.codeproject.com/aspnet/CaptchaImage.asp

#Coding Horror: An ASP.NET CAPTCHA Server Control
http://www.codinghorror.com/blog/archives/000094.html
Just as a note, CAPTCHA implemented in this way does not conform to
accessibility standards.
Let us know if you need further information.
Sincerely,
Walter Wang (wa****@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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