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From: Zhi-Qiang Ni[MSFT] on 3 May 2010 06:23
Hi Jason,

The error message indicates the application attempted to perform an
operation not allowed by the security policy. It is probably the trust
level is incorrectly configured for you application.

By default , the trust level is full , all privileged operations are
supported. When an ASP.NET application domain is created, ASP.NET reads
the value specified for the level attribute of the trust configuration
element, creates an instance of the AspNetHostingPermission class with the
specified Level attribute, and then adds the class to the permission set
for the application domain. You will see the above error if the trust
levels are incorrectly configured or modified.

In this case, the trust configuration element in root web.config on your
problem machine might be modified or it was override in a sub web.config
file in your application. You can modify the trust level back to full by
adding the following configuration section in the web.config file in your
site root.

<configuration>
<system.web><trust level="full" originUrl="" /></system.web>
</configuration>

Here is some related information about the ASP.Net Trust Levels and Policy
files, for your reference:
trust Element (ASP.NET Settings Schema)
http://msdn.microsoft.com/en-us/library/tkscy493.aspx
http://support.microsoft.com/kb/910449
http://msdn.microsoft.com/en-us/library/xady2w27(v=VS.100).aspx
http://msdn.microsoft.com/en-us/library/wyts434y.aspx

If you problem persists, please feel free to let me know. Thanks.

--
Sincerely,
Zhi-Qiang Ni
Microsoft Online Support
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