System.Net.NetworkInformation.NetworkInformationPermission.AddPermission C# (CSharp) Method

        public void AddPermission(NetworkInformationAccess access) { }
        public bool IsUnrestricted() => true;

 public override IPermission CreatePermission()
 {
     NetworkInformationPermission permission = null;
     if (base.Unrestricted)
     {
         return new NetworkInformationPermission(PermissionState.Unrestricted);
     }
     permission = new NetworkInformationPermission(PermissionState.None);
     if (this.access != null)
     {
         if (string.Compare(this.access, "Read", StringComparison.OrdinalIgnoreCase) == 0)
         {
             permission.AddPermission(NetworkInformationAccess.Read);
             return permission;
         }
         if (string.Compare(this.access, "Ping", StringComparison.OrdinalIgnoreCase) == 0)
         {
             permission.AddPermission(NetworkInformationAccess.Ping);
             return permission;
         }
         if (string.Compare(this.access, "None", StringComparison.OrdinalIgnoreCase) != 0)
         {
             throw new ArgumentException(SR.GetString("net_perm_invalid_val", new object[] { "Access", this.access }));
         }
         permission.AddPermission(NetworkInformationAccess.None);
     }
     return permission;
 }