The last two arguments of this method, IAsyncResult and object, will be discussed shortly.
而后两个参数，IAsyncResult和object，稍后再做讨论。
The method returns an IAsyncResult, which can be used to monitor completion, wait on the WaitHandle, or complete the asynchronous call.
这个方法返回一个IAsyncResult，它可以被用在监测完成，也可以等待在WaitHandel，或者完成异步调用。
The method returns an IAsyncResult, which can be used to monitor completion, wait on the WaitHandle, or complete the asynchronous call.
这个方法返回一个IAsyncResult，它可以被用在监测完成，也可以等待在WaitHandel，或者完成异步调用。
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