CAPTCHA

Since my last release of the MVC toolkit some major changes have taken place in the MVC Framework. I am going to do a quick run through of how they changed the MVC CAPTCHA for the better. Originally in MVC Preview Release 1 for the MVC CAPTCHA many of you remember that the indicator for a valid CAPTCHA was passed through the parameters of the action method like so: [ControllerAction] [CaptchaValidation("captcha")] public void Register(bool captchaValid, string otherParameters) { // do stuff } However when Preview Release 2 came out the ability to pass the parameter through the action method was broken. So I had to create a hack around this: ...

My last article on ASP.NET MVC CAPTCHA was very well received by many of my readers and it even caught the eye of the DotNetKicks crowd. Now that MVC Preview 2 was released last week, many new features make encapsulating my CAPTCHA control even easier. Most notably is the ActionFilterAttribute which allows you to override the Pre and Post action events for any action the attribute is applied to. Basically everything works the same as it did in the previous article. I just modified things for MVC Preview 2. To validate the CAPTCHA you add the attribute CaptchaValidation to the action. ...

Note: Most recent update for MVC Release Candidate 3 is out. So my MVC application that I have been working on required a CAPTCHA today. The problem is that all of the solutions out there, that I could find for ASP.NET, are control based and I wanted a more MVC approach. I know I could have easily implemented one of them using the Html.RenderControl(), however I want to use a MVC approach to the CAPTCHA authentication box. So I started out with Jeff Atwood’s CAPTCHA Control made for ASP.NET 2.0 in VB.NET 2005. I then converted it to C# and modified and expanded on it for the MVC framework. The following is the result of my work. ...