captcha

Accepted answer

http://nugetmusthaves.com/Tag/captcha

http://www.c-sharpcorner.com/UploadFile/bd8b0b/how-to-implement-captcha-in-Asp-Net-mvc/

http://stackoverflow.com/questions/9614223/implementing-a-captcha-in-mvc-3-0-and-latter

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Without any packages install then used Captcha

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https://www.youtube.com/watch?v=aQ-I9gk4_vs

http://www.codeproject.com/Tips/781675/Captcha-Code-Implementation-in-MVC

http://www.codeguru.com/csharp/article.php/c19013/Creating-and-Using-a-CAPTCHA-in-ASPNET-MVC.htm

https://captchamvc.codeplex.com/

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http://www.c-sharpcorner.com/UploadFile/bd8b0b/how-to-implement-captcha-in-Asp-Net-mvc/

u can see this link

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