A potentially dangerous Request.Form value was detected from the client

A potentially dangerous Request.Form value was detected from the client

If you are receiving the A potentially dangerous Request.Form value was detected from the client error while a PostBack occurs (submitting a form, for instance) it is most likely because in the PostBack content, there are HTML or HTML-like tags. This is ASP.NET’s defense mechanism that prevents the users of a website to try and inject code into forms, as a way to hack into the websites.

To fix this, you can set the validateRequest attribute to false, either for the entire ASP.NET web application, or just for one page. To disable validateRequest for a single page, go to that page’s Page attribute (located at the top of the markup), and set validateRequest to false, as you can see at the end of the example below:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="SamplePage.aspx.cs" MasterPageFile="DefaultLayout.master" Inherits="Admin_SamplePage" ValidateRequest="false" %>

If you prefer to set this value for all the pages in your ASP.NET web application, open (or create) the web.config file and add the <pages validateRequest="false" /> tag inside the system.web tag, as shown in the example below:



    <pages validateRequest="false" />


Nathan Pakovskie is an esteemed senior developer and educator in the tech community, best known for his contributions to Geekpedia.com. With a passion for coding and a knack for simplifying complex tech concepts, Nathan has authored several popular tutorials on C# programming, ranging from basic operations to advanced coding techniques. His articles, often characterized by clarity and precision, serve as invaluable resources for both novice and experienced programmers. Beyond his technical expertise, Nathan is an advocate for continuous learning and enjoys exploring emerging technologies in AI and software development. When he’s not coding or writing, Nathan engages in mentoring upcoming developers, emphasizing the importance of both technical skills and creative problem-solving in the ever-evolving world of technology. Specialties: C# Programming, Technical Writing, Software Development, AI Technologies, Educational Outreach

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