The CAS policy explicitly used by this method has been deprecated by. NET Framework.

The CAS policy explicitly used by this method has been deprecated by. NET Framework.

When an application developed with vs2008 is opened in vs2012, the following message is displayed:

The CAS policy explicitly used by this method has been deprecated by. NET Framework. To enable the CAS policy for compatibility reasons, use the NetFx40_LegacySecurityPolicy configuration switch.

I searched for related information on the Internet and checked the Microsoft Help file. There are roughly two methods mentioned:

1. Add C: \ Program Files (x86) \ Microsoft Visual Studio 10.0 \ Common7 \ IDE \ devenv.exe. config in the default vs installation directory.

<Configuration>
<Runtime>
<NetFx40_LegacySecurityPolicy enabled = "true"/>
</Runtime>
</Configuration>

This method has been tried locally.

2. Add the following content to the application configuration file web. config:

<System. web>

<Trust level = "Full" legacyCasModel = "true"/>

</System. web>

After the application is added, the application runs normally.