The UpdateProgressBar function can be called in client script and allows you to update the the progress bar on the client side.
This method is automatically generated into the document when the control is loaded and is always available when the control is on the page.
The Client ID of the ProgressBar Control. Note this ID might be the control's UniqueId!
The percentage of completion as a whole integer or integer string.
A Message to display at the top of the progress display
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