冠霖的部落格

An ASP.NET CAPTCHA Server Control

A few days ago, I found a really cool CAPTCHA ASP.NET code sample. I converted it to VB.NET and repackaged it as a full blown ASP.NET server control:

It's as simple as I could make it: a total drag and drop, set the (three) properties and forget it implementation. The only tricky part was dealing with the dynamically generated image. You will have to add this HttpHandler section to your web.config file when you use the CaptchaControl

其他的sample跟教學

http://aspnet.4guysfromrolla.com/articles/060706-1.aspx

http://planetoid.info/weblog/2004/10/30/000501.html
        
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