By now, virtually every ASP.NET developer is familiar with the DataGrid control, an extremely powerful and versatile control for displaying data. (If you are not familiar with the DataGrid, I suggest that you start with Scott Mitchell's An Extensive Examination of the DataGrid Control article series.) Personally, I've used the DataGrid control in numerous projects and often find myself trying to make the DataGrid's rendered output more aesthetically appealing.One such aesthetic technique, used by sites like Yahoo! Mail and Hotmail, is automatic highlighting of the row the user's mouse is positioned over. That is, when the end user moves his mouse over the DataGrid's data, the DataGrid row the mouse currently resides over would have a different background color than the other rows.