从客户端(txtNewsContent="<hr />")中检测到有潜在危险的 Request.Form 值。怎么办呀?

<system.web>
<httpRuntime requestValidationMode="2.0" executionTimeout="3600" maxRequestLength="1048576"/>
<pages validateRequest="false" controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID" enableEventValidation="false" viewStateEncryptionMode="Never" enableViewStateMac="false"/>
</system.web>