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SimpleMvcCaptcha(验证码) 源码
项目描述：
ASP.NET MVC 3简单算数表达式验证码，使用 HtmlHelper扩展方法。没有使用WCF等功能。使用C#编写。
关键特性：
Render captcha image based on simple ariphmetic expressions.
Randomly substitutes operators by predefined text ("+" -> "plus", "-" -> "minus").
Text changes its color randomly.
No open text expressions in code - all data is encrypted.
No WCF, cache, .axd etc required. Only HtmlHelper and sprecial Action for image genration.
Fully customizable server side. You can set font, size and other parameters via web.config file. If not - use default settings.
Fully customizable client side. Just redefine CSS classes for div and input elements.
