[单选]
You are creating a Windows component by using the .Net Framework 3.5.the component will be used in Microsoft Word 2007 by using a ribbon button.The component is used for uploading files. You find that Word 2007 becomes non-responsive during the upload. You need to ensure that the application completes the upload efficiently.
What should you do？（）

A . Use the AsyncResult.SyncProcessMessage method.
B . Call the BeginInvoke method， perform the upload， and then call the EndInvoke method
C . Retrieve a WaitHandle from an implementation of the IAsyncResult interface before the upload.
D . Set the IsCompleted property on an implementation of the IAsyncResult interface before the upload.

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You are creating a Windows component by using the .Net Framework 3.5.the component will be used in Microsoft Word 2007 by using a ribbon button.The component is used for uploading files. You find that Word 2007 becomes non-responsive during the upload. You need to ensure that the application completes the upload efficiently.
What should you do？（）

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