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How to create a math captcha image?

How to create a math captcha image in Asp.net using C#?
Something like this: http://www.nathanieljohnston.com/index.php/2008/10/math-captchas-in-asp/ . The link I am sharing here is for a captcha created in Asp, I am in need of same thing in Asp.net using C#.

Thanks
 
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TheMak
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TheMak
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lazyberezovskyCommented:
Why not to use reCAPTCHA? Or wheel is not invented yet? :)
http://recaptcha.net/plugins/aspnet/
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TheMakAuthor Commented:
Those above are simple captcha, I want math captcha example 12+6=          ............
The user should enter the sum of those numeric value to proceed further. Below link contain same thing but in asp and I need to do that in asp.net.

http://www.nathanieljohnston.com/index.php/2008/10/math-captchas-in-asp/ 


Regards,
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TheMakAuthor Commented:
Thanks guys I got the solution from this site http://aspxcode.somee.com/captcha/Default.aspx
I have downloaded the source code and its working fine. We will modify according to our need....

Regards,
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TheMakAuthor Commented:
I am still looking for Math captcha and might be more interesting what I got. Please provide me some more help on math captcha ways..

Regards,
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