0

I'm working on asp.net web application where I need to use CAPTCHA to test input enter into textbox please let me know very simple way to implement CAPTCHA in asp.net.

Neo
  • 15,491
  • 59
  • 215
  • 405
  • 2
    what have you tried? there are numerous samples of how to integrate this - people wont just do your work for you – stack72 Aug 18 '11 at 10:08
  • 1
    [Possible duplicate?](http://stackoverflow.com/questions/696398/what-is-the-best-recomended-captcha-component-for-asp-net) – Sumo Aug 18 '11 at 10:14

2 Answers2

1

Simple Google search returns this article:

http://www.codeproject.com/KB/custom-controls/CaptchaControl.aspx

I'd recommend working through this tutorial, then if you have any problems, then ask questions. Like @Stack72 has stated, people won't just do it all for you, but will help if you get stuck!

Curtis
  • 101,612
  • 66
  • 270
  • 352
1

Create a handler (ashx).

Generate a random string, save that string into session, then use GDI+ to draw an image and sent it to response with content type is image/...

On captcha validation, load previous string from session and do the comparison.

Tu Tran
  • 1,957
  • 1
  • 27
  • 50