A potentially dangerous Request.Form value was detected from the client
2017-04-25 14:32
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错误解决：A potentially dangerous Request.Form value was detected from the client
在网站后台插入数据，返回下面的错误：系统检测到有潜在危险的 Request.Form 值。A potentially dangerous Request.Form value was detected from the client (txtTest="<b>").
这个是因为requestValidationMode是asp.net提供的，用于防止cross-site scripting (XSS)攻击！默认就是开启的！
.net 4之前，它只在aspx文件及类文件被调用的时候，才会起作用！
.net 4之后，它会对所有的http请求起作用，即使用了ValidateRequest=False
要解决验证错误，只能继续使用.net 2.0的请求验证功能：
即在web.config文件中的<system.web>标签中加入下面的代码。
<httpRuntime requestValidationMode="2.0"/>
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