private OperationHandle QueryInstancesCore(string namespaceName, string queryDialect, string queryExpression, CimOperationOptions options, CimAsyncCallbacksReceiverBase asyncCallbacksReceiver) { OperationHandle operationHandle = null; SessionMethods.QueryInstances(this._handle, options.GetOperationFlags(), options.GetOperationOptionsHandle(), namespaceName, queryDialect, queryExpression, options.GetKeysOnly(), options.GetOperationCallbacks(asyncCallbacksReceiver), out operationHandle); return operationHandle; }