顯示 DataGridView 的行號，可在 DataGridView 的 RowPostPaint 事件中加入以下程式碼

Private Sub DataGridView1_RowPostPaint(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewRowPostPaintEventArgs) Handles DataGridView1.RowPostPaint
    Dim rectangle As New Rectangle(e.RowBounds.Location.X, e.RowBounds.Location.Y, DataGridView1.RowHeadersWidth – 4, e.RowBounds.Height)
    TextRenderer.DrawText(e.Graphics, (e.RowIndex + 1).ToString(), DataGridView1.RowHeadersDefaultCellStyle.Font, rectangle, DataGridView1.RowHeadersDefaultCellStyle.ForeColor, TextFormatFlags.VerticalCenter Or TextFormatFlags.Right)
End Sub