DataGridのレコードセレクタについて

public class DataGrid2: DataGrid {
	public DataGrid2(){
	}

	protected override void OnPaint(PaintEventArgs e) {
		base.OnPaint(e);
		int wStartRow = VertScrollBar.Value;
		for(int i = wStartRow; i < wStartRow + VisibleRowCount; i++){
			Rectangle wRect = GetCellBounds(i, 0);
			int y = wRect.Y;
			int wCellHeight = wRect.Height;
			SolidBrush wBackBrush = new SolidBrush(BackColor);
			SolidBrush wForeBrush = new SolidBrush(ForeColor);
			Pen wBorderPen = new Pen(GridLineColor);
			Pen wLightPen = new Pen(SystemColors.ControlLightLight);
			try {
				Rectangle wCellBound;
				wCellBound = new Rectangle(1, y, this.RowHeaderWidth - 1, wCellHeight);
				if(e.ClipRectangle.IntersectsWith(wCellBound)){
					e.Graphics.DrawRectangle(wBorderPen, 1, y, this.RowHeaderWidth - 1, wCellHeight);
					e.Graphics.FillRectangle(Brushes.AliceBlue, wCellBound);
					e.Graphics.DrawString((i + 1).ToString(),Font, wForeBrush, wCellBound);
				}
				e.Graphics.DrawLine(wLightPen, 1, y, 1, y + wCellHeight);
			} finally {
				wLightPen.Dispose();
				wBorderPen.Dispose();
				wForeBrush.Dispose();
				wBackBrush.Dispose();
			}
		}
	
	}
}