How To Create A Captcha Application

Sep 16, 2010

How can one create a captcha application as a field in the form say registration form...?

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I searched a little on the site but i don't see something approved.What i basically want is a simple captcha control on my page.
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http://www.codeproject.com/KB/custom...haControl.aspx

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I have a blank page with a Captcha called Captcha.aspx. I would like to add this as the second step to a CreateUserwizard. The following is what I want to achieve:i) User enters their Username etc in CreateUserwizard and clicks the CreateUser Button(ii) After clicking the CreateUser button, user sees the Captcha.aspx page and enters the correct stuff in the Captcha box and click a continue button(iii) User account is created if correct details were entered in the Captcha else no account is created, rather the user is sent to a page informing him or her that no account has been created

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I'm implementing captcha on my website like the one in [URL]. It is working fine while running on VS2008. However, not when uploaded on IIS. I think the image is being blocked by IIS.. anyone knows how to fix this?

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I am developing a website where I need a captcha control and I want to develop the captcha control itself, so in the future I can change its length, type, color, and have it be easy to manage as well.

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I could really use some help here. I owuld like to implement a simple CAPTCHA mechanism with the membership system. Can someone please help me out. I have found MSCAPTCHA, but it doesn't seem to work in the .NET 3.5 world. I have been pulling my hair out for a couple of days now.

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Sep 15, 2010

Can anyone tell me what does CAPTCHA do as far as security issue is concerned?Registration form of many sites have this field but how it works?

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.net - How To Implement A Captcha In WebForm

Aug 24, 2010

How can I implement a CAPTCHA in my ASP.NET WebForm? It is a registration form. I am a beginner in ASP.NET.

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I am using jquery.load() to load a page on click of a button.The page that will be loaded contains a captcha.
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Web Forms :: How To Insert CAPTCHA

Jan 21, 2010

My question to all. I have a feedback form php form. Here its code.

[Code]....

I wish to insert in this form CAPTCHA. There is for somebody have a code CAPTCHA which well works? And how to me it to insert?

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I have used captcha for security. It is working fine when i run web page on my PC. but when i upload page on web domain, it is not showing Captcha.

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AJAX :: Captcha Not Working?

Jan 24, 2011

Here is the code:

[Code]....

code behind:

[Code]....

The problem is that if the textcap changetext event is fired which is in the updatepannel then the captcha will always validate to false. If the textcap changetext event is not fired then all goes well.

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Web Forms :: How To Implement Captcha

Jun 13, 2012

The captcha is working fine..but when we reload the page and click the verify button without entering enything..it's throwing error. Also it's throwing the error when we enter the code wrong 2 times..It's throwing the error as

Object reference not set to an instance of an object.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Line 15:protected void btnVerify_Click(object sender, EventArgs e)
Line 15: {
Line 16: Captcha1.ValidateCaptcha(txtCaptcha.Text.Trim());
Line 17:
Line 18: if (Captcha1.UserValidated)

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VS 2010 Looking For Free Captcha Control?

Feb 7, 2011

I am looking for captcha control for .net framework 4.0

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