在RowIndex 0上改变DataGridviewCellStyle

我使用下面的代码来更改datagridview的CellEnter事件中的单元格样式。但是，如果我删除if语句，所有行将在数据绑定后被格式化为粗体。有什么建议吗?

DataGridViewCellStyle oStyle = new DataGridViewCellStyle();
            oStyle.Font = new Font("Microsoft Sans Serif", 9.25f, FontStyle.Bold);
            if (e.RowIndex > 0)
            {
                dataGridView1.Rows[e.RowIndex].Cells[0].Style = oStyle;
                dataGridView1.Rows[e.RowIndex].Cells[1].Style = oStyle;
                dataGridView1.Rows[e.RowIndex].Cells[2].Style = oStyle;
                dataGridView1.Rows[e.RowIndex].Cells[3].Style = oStyle;
                dataGridView1.Rows[e.RowIndex].Cells[4].Style = oStyle;
                dataGridView1.Rows[e.RowIndex].Cells[5].Style = oStyle;
                dataGridView1.Rows[e.RowIndex].Cells[6].Style = oStyle;
                dataGridView1.Rows[e.RowIndex].Cells[7].Style = oStyle;
                dataGridView1.Rows[e.RowIndex].Cells[8].Style = oStyle;
            }