Message in Russian (Русский)

Для вызовов асинхронных методов на стороне сервера Ваш метод Begin должен возвращать корректное значение IAsyncResult. Метод Begin не должен возвращать неопределенное значение.

Unlocalized message

For server-side asynchronous method calls, your Begin method must return a valid IAsyncResult. Your Begin method cannot return null.

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