private void gridView1_RowCellStyle(object sender,DevExpress.XtraGrid.Views.Grid.RowCellStyleEventArgs e)
    {
        if(e.Column.FieldName == "Field2")
        {
            var data = gridView1.GetRow(e.RowHandle) as Sample;
            if(data == null)
                return;

            if (data.Field2 < 0)
                e.Appearance.ForeColor = Color.Red;
        }
    }