asp.net - The application attempted to perform an operation not allowed by the security policy

Question

I have developed an Asp.net website in Visual Studio 2008 and it worked fine while using Vista OS but my workstation got upgraded to Windows 7 and I now get following error:

Security Exception Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.

Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

I get this error while running on my local machine from within Visual studio... I have already googled the error but nothing i found helps so far. I don't get the error when deployed on server, just on my local.

The website references .dll projects that I have created in the same solution. The error seems to occur when I try to instaniate an object contained within any one of these .dll projects.

This setting in Web.config did not help:

<trust level="Full" originUrl="" />

neither did this:

<securityPolicy>
    <trustLevel  name="Full" policyFile="internal" />
</securityPolicy>

Answer 1

This worked for me. in web.config add

<system.web>
   <trust level="Full" />
</system.web>