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Asked: 2026-06-14T07:41:35+00:00

I was reviewing some ASP.NET MVC code, specifically a web.config file. I noticed this

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I was reviewing some ASP.NET MVC code, specifically a web.config file.

I noticed this in the appSettings section:

<add key="PreserveLoginUrl" value="true" />

  1. What does this do?
  2. When was it introduced to ASP.NET MVC?

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  1. Editorial Team

    From the MVC 4 Whitepaper:

    When WebMatrix.WebData.dll is included in in the /bin directory of an ASP.NET MVC 4 apps, it takes over the URL for forms authentication. Adding the WebMatrix.WebData.dll assembly to your application (for example, by selecting “ASP.NET Web Pages with Razor Syntax” when using the Add Deployable Dependencies dialog) will override the authentication login redirect to /account/logon rather than /account/login as expected by the default ASP.NET MVC Account Controller. To prevent this behavior and use the URL specified already in the authentication section of web.config, you can add an appSetting called PreserveLoginUrl and set it to true

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