Message in Japanese (日本語)

サーバー側の非同期メソッド呼び出しに対して、Begin メソッドは有効な IAsyncResult を返さなければなりません。Begin メソッドで Null を返すことはできません。

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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