KB-TimothyHumphrey CAPTCHA causes post preview error
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I added TimothyHumphrey's CAPTCHA web control to CS2.1 forum post editor to prevent from spam-post. A friend told me, when he wrote a post in anonymous, press preview tab will cause a AJAX error. After tracing request and response with Fiddler, I found the Validate() method of TimothyHumphrey.WebControl.Captcha throw a null reference exception. Dig deeper, the request contain several Ajax_blah post variables, and I guess that TimothyHumphrey's CAPTCHA doesn't behave normally duration AJAX post back model. After modified Validate() method to skip checking when Request["Ajax_CallBackMethod"] is detected, it seems OK now.
TimothyHumphrey.WebControl.Captcha.cs
519 public void Validate() {
520 //2007-02-01 Modified by Jeffrey Lee
521 //Skip the validation while AJAX preview
522 if (this.Context.Request["Ajax_CallBackMethod"] != null)
523 return;
524
525 HttpCookie cookie = this.Context.Request.Cookies[CaptchaImagePage.CookieName];
526 bool valid;
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