Using the RadCaptcha control

RadControls has a RadCaptcha control that can be used in .NET applications or SharePoint web parts. Add the RadCaptcha image handler to the web.config file to use the captcha:

<system.webServer>
...
<handlers>
...
<add name="Telerik.Web.UI.WebResource" path="Telerik.Web.UI.WebResource.axd" verb="*" type="Telerik.Web.UI.WebResource, Telerik.Web.UI, Version=2010.3.1317.35, Culture=neutral, PublicKeyToken=121fae78165ba3d4" />
...
</handlers>
</system.webServer>