BotDetect ASP.NET CAPTCHA Release Notes

v2.0.10 – 06. 04. 2008.

Added "Reload CAPTCHA" button support (allowing users to request a new CAPTCHA code if the current one is unreadable), and the related ReloadEnabled property
Added ASP.NET Ajax built-in compatibility, allowing the "out of the box" Captcha control to validate inside an UpdatePanel
Added built-in SharePoint support (previous versions required source code modifications)
Added support for CAPTCHA image and sound request extension customization via web.config settings
Added a static variant of the Validate() method, allowing easier integration with various Ajax and MVC frameworks
Rewrote the Captcha control rendering code to produce smaller, semantic, XHTML 1.1 Strict compliant markup
Added 3 new Captcha control properties: SoundIconAltText, ReloadIconAltText and CaptchaImageAltText, allowing HTML output string customization
Improved handling of invalid CAPTCHA requests sent by some bots (with &amp;amp;-style constructs in the querystring)
Fixed a bug with the sample projects not performing CAPTCHA validation in IE 6.0 & 7.0 when typing in the CAPTCHA code and pressing Enter
Improved the usability of all samples by automatically lowercasing the CAPTCHA code input while typing
Added a "Simulate Error" button and related instructions to the Troubleshooting sample CAPTCHA projects
Packaged the updated version of the web.config file with the MS Ajax samples, allowing .NET 3.5 machines to use them without running the Visual Studio 2008 Conversion Wizard

Detailed instructions for upgrading to this release can be found in the related migration guide.

Fixed a bug with the CAPTCHA code timeout being set to 20 min even if the Session timeout is longer
Fixed a bug with multiple CAPTCHAs on the same page and only being able to validate the first one
Fixed a bug causing exceptions to be thrown while processing invalid CAPTCHA image/sound requests used by some bots
Fixed the CAPTCHA control's XHTML output to be WCAG AAA compliant

Fixed a bug with the audio CAPTCHA in IE 7.0 / Vista / Media Player 11 (.NET 2.0 version only)
Fixed a bug with the audio CAPTCHA in older versions of IE when using SSL
Fixed the CAPTCHA image and sound links to be XHTML compliant

Fixed a bug causing errors when using the “Sql” and “StateServer” Session State modes (marked the CaptchaCode class as Serializable)
Improved control extensibility (changed useful Captcha class fields and methods from private to protected)
Improved all samples to also work with disabled cookies (.NET 2.0 version only)
Added basic MS ASP.NET 2.0 Ajax Extensions samples (C# and VB.NET) to the installation (.NET 2.0 version only)
Added the “log4net.dll” assembly to the “Troubleshooting” installation folder, which was omitted by error in the previous release (.NET 1.1 version only)

Fixed a bug with the component sometimes throwing exceptions on the Visual Studio design surface

Fixed a bug with the sound link both playing the sound in the background and opening the download dialog in Firefox (.NET 1.1 version only)

Fixed a bug preventing detailed error logging (accidentally deleting inner exception data)
Added a centralized, non-intrusive, BotDetect-only, highly customizable error logging utility
Fixed a bug with "object reference not set…" errors for BotDetect properties in the Visual Studio designer
Fixed a bug displaying the same image and/or breaking validation when using multiple CAPTCHAs per page
Fixed a bug breaking validation with the same page (containing CAPTCHA) opened in multiple browser tabs
Fixed a bug allowing the same code to be used to draw multiple images if both validation and page reloading were skipped
Fixed a bug displaying the same CAPTCHA (but breaking validation) when using the Back button in IE
Fixed a bug with the sound CAPTCHA not working without Javascript
Fixed a bug with the sound CAPTCHA not working in Safari
Fixed a bug with the CAPTCHA image not changing after first load in Opera
Fixed a bug in the uninstallation script occurring on machines without IIS
Fixed a bug in the installation script for ASP.NET not setting the correct runtime version when multiple .NET framework versions are installed
Added a new sample demonstrating CAPTCHA randomization
Added a new sample demonstrating CAPTCHA troubleshooting
Updated and expanded the Help

Added sound CAPTCHA support
Added 10 new CAPTCHA text styles (for a total of 50 different CAPTCHA algorithms)
Improved memory management
Added shared server support
Fixed a CAPTCHA vulnerability allowing the user to bypass the CAPTCHA entirely by replaying a previous ViewState parameter value
Stopped using client side (ViewState) persistence altogether
Added a VB.NET sample demonstrating dynamic setting of all CAPTCHA properties
Fixed a bug preventing ASP.NET 1.1. and ASP.NET 2.0 versions from coexisting on the same machine

Added support for ASP.NET 2.0 (.NET framework 2.0)
Added 21 new CAPTCHA text styles (for a total of 40 different CAPTCHA algorithms)
Some cosmetic changes in existing CAPTCHA text styles

Added 12 new CAPTCHA text styles (for a total of 19 different CAPTCHA algorithms)
Some cosmetic changes in existing CAPTCHA text styles