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  Tutorial: ASP.NET .NET Allowing HTML Input with ASP.NET Tutorial

There's a very good reason why html input in form fields triggers an error. Security. Html injection can be used to really screw a page up - injecting css, javascript, server-side script, meta redirects and more. Asp.net prevents html input by default, so

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HTML Input with ASP.NET

There's a very good reason why html input in form fields triggers an error. Security. Html injection can be used to really screw a page up - injecting css, javascript, server-side script, meta redirects and more.

Asp.net prevents html input by default, so if a user enters a html string into an input field an error is thrown.

To allow html input you have to explicitly set it in the page directive.

<%...@ page language="C#" validaterequest="false" %>
You can also specify it application-wide in your web.config file:

<configuration>
<system.web>
<pages validaterequest="false" />
</styem.web>
</configuration>

You should only apply it application wide when you're using a known and trusted user base. If the page is publicly available then you should apply it only when required, and with careful filtering to remove the dangerous tags.


 

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