DataGrid Selected Item in Wpf

private void SelectionChanged(object sender, SelectionChangedEventArgs e)
{
   DataGrid g = sender as DataGrid;

   // checks if no rows where added (to the selected rows)
   // but at least 1 row removed from the selected rows of the grid
   if (g != null && e.AddedItems.Count == 0 && e.RemovedItems.Count > 0)
   {
      // this selects the first row in the e.RemovedItems collection
      g.SelectedItem = e.RemovedItems[0];
   }
}