I am developing a registration form in that i want to place the CAPTCHA . i generate a random string but how to convert that into the image other wise how can i develop the CAPTCHA code or any reference. thank you
+5
A:
Try out reCpatcha or check out eh blog post "Captcha Using Asp.Net" which I wrote sometime back.
Shoban
2009-11-20 05:58:27
Shoban i referred blog, and i convert into c# but it is giving some error
Surya sasidhar
2009-11-20 06:52:24
....What error?
Shoban
2009-11-20 07:05:55
i send the list of errors to the block owner is there any other reference or any thing thank u for response Mr. Shoban
Surya sasidhar
2009-11-20 09:09:28
ya its working i downloaded the source file and place that code in my application thank u dude working
Surya sasidhar
2009-11-20 09:59:29
A:
While having a captcha may feel like a good feature, it really isn't: Nowadays there's huge swarms of labor houses in China and such where people are paid for successfully filling out captchas. Yes, that means there's thousands of people manually breaking the system all the time.
If I were implementing my own registration protection/antispam system, I'd go with the more cultural one choice which is just a variation of magic words. What I mean that instead of showing barely readable garble, I'd add a small intellectual puzzle and a text field for it's answer, for example asking how much is seven plus six minus one is currently a lot better at detecting both bots and stupid users.
Esko
2009-11-20 06:31:53
A:
Brij
2009-11-20 07:07:15
A:
This is captcha library in C: http://brokestream.com/captcha.html, probably it won't be too hard to port it to C#
Ivan Tikhonov
2009-11-22 20:28:49