Captcha Control

Question

Hi... How can i create a captcha control that generates different types of shapes everytime the page refreshes?

Dipal Choksi · Answer

Check these out: http://www.codeproject.com/KB/web-image/CAPTCHA_Image.aspx http://www.codeproject.com/KB/custom-controls/CaptchaControl.aspx http://www.codeproject.com/KB/aspnet/CaptchaImage.aspx

Jean Paul · Answer

Hello Choko, If you need custom drawing you have to use the System.Drawing classes in ASP.NET. The steps would be.. 1) Create a canvas from bitmap 2) Draw rectangle and other lines (I am not sure a Triangle class exists, but you can create one with the Line class) 3) Randomly generate text 4) Draw the text on canvas 5) Create jpg/png image from it and show it to user with the text box 6) Save the actual text in user session variable (better to pack everything into a control) Regards, Jean Paul

Andile Choko · Answer

yes i have seen that one. The one i want is supposed to generate shapes,like triangle,circle, and etc.

Jean Paul · Answer

I believe there is an existing article on captcha. http://www.c-sharpcorner.com/UploadFile/dhavalweb30/2011/

Captcha Control

Answers (4)