How to solve error 'Exception Details: System.Security.SecurityException: Request failed'.

Programming, error messages and sample code > ASP.NET
We do support ASP.NET Full Trust Level to all of our customer, but if you still got error as below:

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 failed.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

To solve this error, please add code below to your web.config file

        <trust level=”Full”/>
       . . ..