设置datagridview中button按钮的背景颜色

问题：DataGridViewButtonColumn()在datagridview中创建按钮列，如何设置按钮的背景颜色（不是单元格的背景颜色）。

回答：可以在dataGridView1_CellPainting事件里面处理。

private void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
      if (e.ColumnIndex == )//索引0
      {
           e.Handled = true;

           using (SolidBrush brush = new SolidBrush(Color.Red))
           {
                e.Graphics.FillRectangle(brush, e.CellBounds);
           }
           ControlPaint.DrawBorder(e.Graphics, e.CellBounds, Color.Yellow, ButtonBorderStyle.Outset);
      }
      if (e.ColumnIndex == )//索引1
      {
           e.Handled = true;

           using (SolidBrush brush = new SolidBrush(Color.BlueViolet))
           {
                e.Graphics.FillRectangle(brush, e.CellBounds);
           }
           ControlPaint.DrawBorder(e.Graphics, e.CellBounds, Color.Yellow, ButtonBorderStyle.Outset);
      }
}

效果：