Hey,
If you are looking for good free advanced captcha tool, just use Recaptcha. Its a nice free to use pluging available as asp.net plugin dll. There are code plugins available for various programming languages, ajax and non-javascript environment. So i like it. I just find it from some place and started integrating it to my demo project.
Everything goest well with it, accept when I place the control between UpdatePanel control, it was causing problem. It was disapearing when the page postbacks. The work arround to fix this is to make the ChildrenAsTrigger=false. This will fix the problem.
Have fun with this ready made feature and use it without worry in your asp.net projects.
This doesn't work. The reCaptcha control still disappears after submitting from within an UpdatePanel.
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