Number sequence Captcha image, E.g "2,4,_,8"

Question

0.00/5 (No votes)

See more:

Can somebody please assist me, i am building a personal asp.net web application
in C# and i want to include a Captcha.I have decided to use a number sequence, as in "2,4,_,8". The user must fill in the missing value. Also, the placeholder must change on each attempt. I also want the Captcha to monitor unsuccessful IP(i.e Flag them). Thanks in advance

Posted 29-Sep-11 6:47am

Shahir15

Updated 29-Sep-11 7:26am

v3

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Abhinav S · Answer 1 · 2011-09-29T06:57:00

Solution 1

See
CAPTCHA Image[^]
http://www.knowlegezone.com/documents/80/Simple-ASPNET-CAPTCHA-Tutorial/[^]
A CAPTCHA Server Control for ASP.NET[^]

Posted 29-Sep-11 6:57am

Abhinav S

sujit0761 · Answer 2 · 2011-09-29T18:15:00

there is already a ASP.NET server control for this called MScaptcha. its a free control. You can download its dll from the following site

http://www.mondor.org/captcha.aspx[^]

You will get proper documentation, regarding how to use it.

Still for youe help, belowgiven are brief steps how to implement it.

Download the dll and add its refrence to your project and then do the following.

XML

//Web.config

      <httpHandlers>
<add verb="GET" path="CaptchaImage.axd" type="MSCaptcha.CaptchaImageHandler, MSCaptcha"/>

            </httpHandlers>


//In  Aspx page or in user control

<%@ Register Assembly="MSCaptcha"Namespace="MSCaptcha" TagPrefix="cc1" %>

<cc1:CaptchaControl ID="ccJoin" runat="server" CaptchaBackgroundNoise="none" CaptchaLength="5" CaptchaHeight="60" CaptchaWidth="200" CaptchaLineNoise="None" CaptchaMinTimeout="5" CaptchaMaxTimeout="240" />


///C# Code

Button click event

  ccJoin.ValidateCaptcha(txtcaptchatext.Text.Trim());

  if (ccJoin.UserValidated)
        {
//submit form
  }