你好，
你讲的是Unobtrusive Validation吗？
所谓Unobtrusive Validation，就是一种隐式的验证方式，将验证代码和HTML分离，在4.5以上的webform中可以使用。
你想知道如何在APPSETTING里面启用的话，可以参照如下代码：
<appSettings>
<!--启用Unobtrusive Validation，默认开启-->
<add key="ValidationSettings:UnobtrusiveValidationMode" value="WebForm"/>
<!--关闭Unobtrusive Validation-->
<!--<add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>-->
</appSettings>
具体的你可以参照这个
链接里面的第四点介绍。
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