单项选择题
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.
相关考题
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多项选择题
YoudiscoverthataparticulargroupofsettingsnamedUserPreferenceschanges.YouneedtostoretheUserPreferencesettingstopreventaffectingotherapplications.Whichtwoactionsshouldyouperform？（）
A.Use the Properties.USerPreferences object
B.Use the Properties.Settings.Default.Userprefences object
C.Use the ConfigurationManager.AppSettings object during runtime
D.Create the settings by using Application scope
E.Create the settings by using User scope -
单项选择题
You create an isntance of a BackgroundWorker Component named backgroundworker1.You discover that when the application attempts to cancel the background process you get an exception from the following code segment： backgroundworker1.CancelAsync（）； You need to configure the BackgroundWorker component appropriately to prevent to application from exception.What should you do？（）
A.Cancel the background process in the backgroundworker1_DoWork event
B.Set the IsBusy property og backgroundworker1 to True before you attempt to cancel
C.Set the WorkerSupportsCancellation property of backgroundworker1 to true before the code
D.Set the DoWorkEventArgs Cancel property to true -
单项选择题
YouarecreatingaWindowsFormsapplicationbyusingthe.NetFramework3.5.Youplantodesignacompositecontrolfortheapplication.Youneedtoderivethecontrolfromabaseclassthatsupportstemplates.Whatshouldyoudo？（）
A.Derive from the Control class.
B.Derive from the UserControl class.
C.Derive from the ScrollableControl class.
D.Derive from the ContainerControl class.
