ConfigurationPermissionAttribute
Creates a  ConfigurationPermission object that either grants or denies the marked target permission to access sections of configuration files.
                using System.Security;
using System.Security.Permissions;
namespace System.Configuration
{
    [AttributeUsage(AttributeTargets.All, AllowMultiple = true, Inherited = false)]
    public sealed class ConfigurationPermissionAttribute : CodeAccessSecurityAttribute
    {
        public ConfigurationPermissionAttribute(SecurityAction action)
            : base((SecurityAction)0)
        {
        }
        public override IPermission CreatePermission()
        {
            return null;
        }
    }
}