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So after i my self got spammed by a lot of robots on my blog i browsed the internet to find an easy way to add captcha for the comment part of my blog.

So i found the easiest way to do was using recaptcha, which can be found here recaptcha.net. So before we start head over there and create an account.

Step 1:

Create recaptcha.net account  recaptcha.net

 

Step 2:

Download the .Net package containing the recaptcha.dll

 

Step 3:

Download from you site frmBlogComment.ascx placed in siteroot/usercontrols

 

Step4:

Edit frmBlogComment.ascx

add the following lines

 

<%@ Import Namespace="Recaptcha">
<%@ Register TagPrefix="recaptcha" Namespace="Recaptcha" Assembly="Recaptcha">

void btnSubmit_Click1(object sender, EventArgs args)
{
  if (recaptcha.IsValid)
  {
     btnSubmit_Click(sender,args);
  }
}

These lines should be right after the "control tag" "<%@ Control ...... %>"

 

Futher down you can now add the recaptcha usercontrol

<recaptcha:RecaptchaControl
ID="recaptcha"
runat="server"
PublicKey=...
PrivateKey=....
/>

 

ofcourse with your privatekey and publickey..

 

Step 5:

Upload recaptcha.dll to your webroot/bin

Upload the newly edited  frmBlogComment.ascx to you webroot/usercontrols/

 

And you should be all done and no more bots should spam your blog I hope.

This post is for them that dont want to recompile umbraco, it would be a much better solution to add an reference to the recaptcha.dll