var connectionString = "Endpoint=sb://<servername>/;SharedAccessKeyName=RootManageSharedAccessKey;SharedAccessKey=<SharedAccessKey>";
        var queueName = "TestQueue";

        var ns = NamespaceManager.CreateFromConnectionString(connectionString);

        if (!ns.QueueExists(queueName))
            ns.CreateQueue(queueName);

System.UnauthorizedAccessException was unhandled
  HResult=-2147024891
  Message=The remote server returned an error: (401) Unauthorized. InvalidSignature: The token has an invalid signature. TrackingId:<GUID>_G30, SystemTracker:<MyQueue>.servicebus.windows.net