how to use CAPTCHA in asp.net
How to use CAPTCHA in asp.net
In this post we learn how to use how to use CAPTCHA in asp.net, As
we know that CAPTCHA
use for security. Security in the since that Accessing of internet by human. In this Post,
I will explain how to use CAPTCHA
Control in ASP.Net Programming. CAPTCHA verification control helps to avoid spam and
generally used in Contact us or Sign Up forms, contact form and other where we
want to use.
Basically the user is shown an image with some characters and user has to fill the same character in a textbox provided, then the content of the image is matched with the textbox and if it matches it ensures that it’s a valid submission and the form gets submitted.
When we want to protect our web page Access by the automatic
software or utility program. then we want to insured that that is human which access my page.
Some time we see that when we access Google many times in particular time then the google also gives the CAPTCHA verification.
For using this CAPTCHA
verification in asp.net web programming here we give fallowing steps:
step by step todo a CAPTCHA ,for my asp.net web Programming or implementation of How to use CAPTCHA in ASP.Net
Step 1 :
Add the Reference of Mscaptcha.dll file in asp.net web
application.
Step 2:
Register MsCaptcha in wep page.
<%@ Register
Assembly="MSCaptcha"
Namespace="MSCaptcha"
TagPrefix="cc1"
%>
Step 3:
Write some
code in to the web config file in the System.web tag.
<system.web>
<httpHandlers>
<add verb="GET" path="CaptchaImage.axd" type="MSCaptcha.CaptchaImageHandler,
MSCaptcha "/>
<add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler,
System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35"
validate="false" />
</httpHandlers>
</system.web>
Step 4:
Write some
code in to the web config file in the Handlers tag.
<handlers>
<add name="MSCaptcha" verb="GET" path="CaptchaImage.axd" type="MSCaptcha.CaptchaImageHandler,
MSCaptcha "/>
<remove name="ChartImageHandler" />
<add name="CrystalImageHandler.aspx_GET" verb="GET" path="CrystalImageHandler.aspx"
type="CrystalDecisions.Web.CrystalImageHandler,
CrystalDecisions.Web, Version=13.0.2000.0, Culture=neutral,
PublicKeyToken=692fbea5521e1304"
preCondition="integratedMode" />
</handlers>
Step 4 : write code on web page where
you want to add Captcha.
<cc1:captchacontrol ID="ccJoin" runat="server"
CaptchaBackgroundNoise="none"
CaptchaLength="5"
CaptchaHeight="40"
CaptchaWidth="150"
CaptchaLineNoise="None"
CaptchaMinTimeout="5"
CaptchaMaxTimeout="140"
FontColor="Red"
Width="155px"
/>
Step 3:
write on the C# page (code page
) on submit button click event.
ccJoin.ValidateCaptcha(txtCaptcha.Text);
if (!ccJoin.UserValidated)
{
lblMsg.Visible = true;
lblMsg.Text = "Invalid Text. Try
Again!";
return;
//Inform user that his input was wrong ...
}
These are five steps ,by this you can use Captcha in your
application easily. I think this is use full for you ,here we also give you
code .
For view the full code go to the following link and if youneed the download this also.
how to use how to use CAPTCHA in asp.net Second post
how to use how to use CAPTCHA in asp.net Second post
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Reference :
