The Feedback module uses the DNN core CaptchaControl (DotNetNuke.UI.WebControls.CaptchaControl) which does not provide for a case-insensitive comparison of the user entered captcha phrase with that which is randomly generated. The core Captcha control does provide a CaptchaChars property which unless specified in the control markup or the module's codebehind defaults to a-zA-Z0-9. Although such a change would have to be re-applied following each upgrade of the Feedback module, you should be able to add the CaptchaChars attribute/value pair to the control's markup in Feedback.ascx to obtain the desired characters from which the captcha image will be randomly constructed.

There has been some consideration that selection of the default CaptchaControl to be used in a give DNN install follow a provider pattern and be specified in web.config much like the default editor, etc. can be specified.

I also noticed tongiht in DNN 6 (and perhaps in later DNN 5 versions) that the Telerik RadCaptcha control has a wrapper (DotNetNuke.Web.UI.WebControls.DNNCaptcha) and may be used in custom DNN modules. Only minor modifications to Feedback.ascx and Feedback.ascx.vb followed by a re-compile of the module would have to be made to use this control instead of the core CaptchaControl. This control exposes an ignoreCase property as well as other advanced options.

It would be well to add an enhancement request to the Feedback module issue tracker at http://dnnfeedback.codeplex.com to include the use of the DnnCaptcha control in future releases.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
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Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
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@ William
 Thanks for your (as usual) comprehensive and detailed answer.
 Re: codeplex. There are already a few feature requests regarding the core Captcha.
 Re: Captcha config in web.config. Personally I like being able to get at settings in this file.
 
Re: Markup in feedback.aspx. Are you able to provide a sample of this markup please as I am unsure how to effect this modification.
 
 @ Roger: I only just realised that you are responsible for this module now. That is very good news.
 
 In General:
 My big issue with the Captcha as it is now is that it works not only to prevent dirty rotten spambots but also prevents legitimate use. It took me 4 tries to get the correct string. It is almost as difficult as the one Google accounts uses.
 
 Thanks to you both for your quick replies
 
 Ian

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