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Editorial Team
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Asked: 2026-05-16T10:39:57+00:00

I have a page with a button and a textbox, when a input <string>

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I have a page with a button and a textbox, when a input “<string>” in the text box and then I press the button I got this error: A potentially dangerous Request.Form value was detected from the client (TextBox1=”“<string>”“).

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1 Answer

  1. Editorial Team

    This is a security feature of ASP.NET, which prevents a user to submit potentially dangerous code like script blocks.

    You can disable this by setting the validateRequest attribute of the Page directive to false

     <%@ Page validateRequest="false" %>

    or disable it in web.config:

    <configuration>
    <system.web>
        <pages validateRequest="false" />
    </system.web>
</configuration>

    But be careful! As I said, this is a security feature!

    You can read more about it here: http://www.asp.net/learn/whitepapers/request-validation

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