You can use PrepareViewStyleInfo...
private void gridDataBoundGrid1_PrepareViewStyleInfo(object sender, GridPrepareViewStyleInfoEventArgs e)
{
if(e.ColIndex > 0 && e.RowIndex > 0)
{
try
{
double dValue = double.Parse(e.Style.Text);
if( dValue > 100 )
{
e.Style.BackColor = Color.Red;
}
}
catch { } //empty
}
}