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

Recently when I was debugging my application I got the error “Request for the permission of type 'System.Web.AspNetHostingPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.”

Below is the exact error I have received.

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 was very mush sure that I have proper permission in my system and also I am running Visual Studio in Administrator mode. So there is no way I should get security exception.

First thing I checked was the TRUST level in web.config but found that it was set to FullTrust. They suddenly I realized that I am running the code from remote share, I mean from the network drive.Therefore, the remote share that holds the Web applications content requires FullTrust.

There are two ways to solve this error,

1. Copy the complete code in your local drive and run, since you are an administrator to your system there won’t be any issues.

2. Provide FullTrust to your network drive. To provide FullTrust to your network drive you have to follow certain steps. This steps are already documented in Microsoft KB article. I would like you to go through this steps in case if you are interested to provide FullTrust to your network drive.

I hope you are able to resolve this issue now and you are able to debug your application without any problem.

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