Message in Chinese (Traditional) (中文（繁體）)
非同步 'Begin' 方法傳回 null 值，或該值傳遞至 AsyncCallback。非同步 'Begin' 實作必須傳回非 null 的 IAsyncResult，並將相同的 IAsyncResult 物件當做參數傳遞至 AsyncCallback。
Unlocalized message
A null value was returned from an async 'Begin' method or passed to an AsyncCallback. Async 'Begin' implementations must return a non-null IAsyncResult and pass the same IAsyncResult object as the parameter to the AsyncCallback.
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