If True, the FetchRowStyle event will be fired whenever the list is about to display a row of data.
If False (the default), the FetchRowStyle event is not fired.
Set this value to True when you need to perform complex per-row formatting operations that can only be done using the FetchRowStyle event. For example, if you want to apply fonts and/or colors to all rows that satisfy certain criteria, then you need to set the FetchRowStyles property to True and write code for the FetchRowStyle event.
To display every other row in a different color or font, you can simply set the AlternatingRows property to True.