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Let the User Control Long Operations

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To allow the user to control long operations, use a single CommandButton to control starting and stopping a looping process:

 Dim Running As BooleanPrivate Sub CmdStartStop_Click()	If Running Then		' Stop the process.		Running = False		CmdStartStop.Caption = "Start"		CmdStartStop.Enabled = False	Else		' Start the process.		Running = True		CmdStartStop.Caption = "Stop"		RunLongProcess		CmdStartStop.Enabled = True	End IfEnd SubPrivate Sub RunLongProcess()	Do While Running		' Do something repeatedly.		:		DoEvents	LoopEnd Sub

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