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This property sets the text of the label for a System.Web.UI.WebControls.WebParts.WebPartVerb object; it is what represents the verb to users in the UI.
If developers (optionally) assign a value to the WebPartVerb.ImageUrl property, an image or icon represents the verb in the UI, and in certain cases (such as when the verb is normally rendered by a button or hyperlink) the image appears instead of the text label.