BotDetect ASP.NET CAPTCHA Release Notes

documentation > asp.net captcha

This is the version history of the BotDetect ASP.NET CAPTCHA Control:

BotDetect 2.0

v2.0.15 (2009–11–23)
v2.0.14 (2009–09–14)
v2.0.13 (2009–02–02)
v2.0.12 (2008–07–03)
v2.0.11 (2008–05–29)
v2.0.10 (2008–04–06)
v2.0.9 (2008–02–06)
v2.0.8 (2007–10–21)
v2.0.7 (2007–07–18)
v2.0.6 (2007–07–02)
v2.0.5 (2007–03–20)
v2.0.4 (2007–03–13)
v2.0.3 (2007–03–02)
v2.0.2 (2006–06–25)
v2.0.1 (2006–06–18)

v2.0.15 Released 2009–11–23 v2.0.15 migration guide

Fixed a bug with the CAPTCHA image failing to render on some servers even when the CaptchaHandler is properly registered
Fixed a bug with the Captcha control breaking on shared servers (running in Medium Trust)
Fixed a bug with the CAPTCHA event registration occasionally throwing "key already exists" exceptions during concurrent page access (implemented proper global event locking)
Fixed a bug with the CAPTCHA Troubleshooting code samples not working properly on IIS 7.5 / Windows Server 2008 R2 and Windows 7 (the InstallSamples.bat script now also grants log file write access to the appropriate ApplicationPoolIdentity user)
Added a X-Robots-Tag Http header to CAPTCHA image and sound Http responses that prevents search engine indexing of CAPTCHA images and sounds
Improved handling of invalid CAPTCHA Http requests (basic problem identification)

[back to top]

v2.0.14 Released 2009–09–14 v2.0.14 migration guide

Fixed a bug with CAPTCHA validation failing inside UpdatePanel variants in Telerik and other non-Microsoft Ajax frameworks
Fixed a bug with CAPTCHA client-side scripts not working when the Captcha control is not visible on the first page load, but gets added after a partial postback
Fixed a bug causing key conflicts with applications or other components using Rick Strahl's ClientScriptProxy
Fixed a bug allowing direct access to sound CAPTCHAs even if the Captcha.SoundEnabled property is set to false
Fixed a bug with the BotDetect layout stylesheet not overriding other, possibly conflicting CSS declarations included on the page
Improved validation of CAPTCHA image and sound request querystring parameters, rejecting a wider variety of automated requests sent by some bots
Improved the BotDetect Troubleshooting utility and sample projects, allowing users to also log all CAPTCHA validation attempts
Improved usability of the progress indicator for CAPTCHA image reloading, using a locale-independent animation
Improved flexibility of CAPTCHA image reloading by adding custom PreReloadCaptchaImage and PostReloadCaptchaImage client-side events that can be handled by user code
Improved usability of all BotDetect sample projects by automatically clearing the CAPTCHA code user input after clicking the Reload CAPTCHA button
Improved the ASP.NET MVC CAPTCHA sample projects, using a custom ActionFilterAttribute for CAPTCHA validation
Separated ASP.NET Ajax sample projects for .NET Framework versions 2.0 and 3.5
Marked the Lanap.BotDetect.dll assembly as CLS-Compliant

[back to top]

v2.0.13 Released 2009–02–02 v2.0.13 migration guide

Added ASP.NET MVC RC1 support and ASP.NET MVC RC1 CAPTCHA code samples (C# BotDetect ASP.NET MVC Demo and VB.NET BotDetect ASP.NET MVC Demo)
Fixed a bug with the PreDrawCaptchaImage handler being re-registered and executed multiple times (the number cumulatively increasing for every page load)
Fixed a bug with multiple randomized CAPTCHA controls in the application all using the last registered PreDrawCaptchaImage handler instead of the appropriate one
Fixed a bug with the CAPTCHA CodeLength and CodeType not being randomized on the first page load
Fixed a bug with the CAPTCHA validation failing when there is an ASP.NET Ajax UpdatePanel on the page, but the Captcha control is not within it
Fixed a bug with the CAPTCHA sound and reload buttons not being focusable using the keyboard
Fixed a bug with the audio CAPTCHA not playing in IE when using SSL offloading (added client-side SSL detection)
Fixed a bug with the CustomSessionIDManager exposing the ASP.NET SessionID in plaintext
Fixed a bug with multiple CAPTCHA control instances on the same page and CAPTCHA CSS declarations (changed all BotDetect CSS declarations to use CSS classes instead of ids)
Fixed a bug with the CAPTCHA Troubleshooting code samples not registering the ErrorTrackingModule when using IIS 7.0 Integrated Mode
Added a missing </div> to the ASP.NET Ajax CAPTCHA code samples

[back to top]

v2.0.12 Released 2008–07–03 v2.0.12 migration guide

Fixed a bug with the audio CAPTCHA not playing in IE when using SSL
Fixed a bug with the audio CAPTCHA not playing in Opera 9.5
Fixed a bug with the CAPTCHA image not displaying when the IIS virtual folder name contains spaces
Fixed a bug with the CAPTCHA validation always returning false for all validation attempts after the first one when placed inside a Telerik RadAjaxPanel
Fixed a bug with the sample projects not displaying the CAPTCHA image when using IIS 7.0 Integrated Mode

[back to top]

v2.0.11 Released 2008–05–29 v2.0.11 migration guide

Fixed a bug with the CAPTCHA randomization being bypassed when clicking the Reload CAPTCHA button, or for other direct CAPTCHA image requests
Fixed a bug with the sequential Reload CAPTCHA button clicks appending new values to the querystring instead of replacing the existing one
Fixed a bug with the CAPTCHA stylesheet not resetting link styles for the Reload and Sound CAPTCHA buttons, causing layout problems if the page link style includes padding etc.
Fixed a bug with the CAPTCHA validation always failing if the .aspx form path includes spaces or other Url-encoded characters
Fixed a client-side script include bug occurring when a Captcha control is placed inside a MultiView control which is inside an ASP.NET Ajax UpdatePanel
Added support for CAPTCHA image and sound request full path customization (instead of just the extension) via web.config settings
Improved handling of invalid CAPTCHA requests sent by some bots (repeated CAPTCHA image or sound requests with expired parameters)

[back to top]

v2.0.10 Released 2008–04–06 v2.0.10 migration guide

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

[back to top]

v2.0.9 Released 2008–02–06

Minor ASP.NET 2.0 Ajax CAPTCHA samples code cleanup
Some cosmetic changes in existing CAPTCHA text styles

[back to top]

v2.0.8 Released 2007–10–21

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

[back to top]

v2.0.7 Released 2007–07–18

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

[back to top]

v2.0.6 Released 2007–07–02

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)

[back to top]

v2.0.5 Released 2007–03–20

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

[back to top]

v2.0.4 Released 2007–03–13

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)

[back to top]

v2.0.3 Released 2007–03–02

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

[back to top]

v2.0.2 Released 2006–06–25

Updated licensing information packaged in the setup

[back to top]

v2.0.1 Released 2006–06–18

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

[back to top]

v1.5.3 Released 2005–08–13

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

[back to top]