Capcha In ASP.NET??

Capcha In ASP.NET??

What is capcha??

A CAPTCHA  is a type of challenge-response test used in computing as an attempt to ensure that the response is not generated by a computer. The process usually involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because other computers are supposedly unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human.

How to implement in ASP.NET?

Step 1: In the page add the following:

<%@ Register Assembly="WebControlCaptcha" Namespace="WebControlCaptcha" TagPrefix="Capcha" %>

<div style="width: 230px;" class="greenContainer">
                            

<Capcha:CaptchaControl id="capcha" enableviewstate="false" enabletheming="false"
 captchamaxtimeout="300" runat="server" layoutstyle="Vertical" cssclass="fL" />
 

</div>

Step 2: Add the following css

.greenContainer
{border:1px solid #6a377d;background-color:#f7f2f9;overflow:auto;padding:10px;}

Step 3: In the Save button

The save operation should be done only within

if (Page.IsValid)

{}

 Step 4: Add the following in the web.config file.

<system.web>

<httpHandlers>

<add verb="GET" path="CaptchaImage.aspx" type="WebControlCaptcha.CaptchaImageHandler, WebControlCaptcha"/>

</httpHandlers>

</system.web>