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Editorial Team
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Asked: 2026-06-07T03:13:46+00:00

I am creating a web application which will run on a local machine. I

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I am creating a web application which will run on a local machine. I am trying to write code on the print button.

While initializing new PosExplorer() I get the error:

The type initializer for ‘Microsoft.PointOfService.Management.Explorer’ threw an exception.".

In the inner exception: "This method explicitly uses CAS policy, which has been obsoleted by the .NET Framework. In order to enable CAS policy for compatibility reasons, please use the NetFx40_LegacySecurityPolicy configuration switch."

I have installed microsoft POS for .net 1.12 and have also tried using NetFx40_LegacySecurityPolicy enabled="true" in the web.config as well as devenv.exe.config file, but none of them resolved my issue.

I am using vs 2010.

Any help will be highly thanked…

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1 Answer

  1. Editorial Team

    Resolved the issue by adding

    <runtime>
<NetFx40_LegacySecurityPolicy enabled="true"/>

    in to the path
    C:\Program Files\Common Files\microsoft shared\DevServer\10.0\WebDev.WebServer40.exe

    And restart the development environment.
    Thanks

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