dataGridView1 CellValueChanged event

protected override void OnCellValueChanged(DataGridViewCellEventArgs e)
{
    base.OnCellValueChanged(e);

    // Test value of cell which just changed
    if (uint.Parse(this.Rows[e.RowIndex].Cells[e.ColumnIndex].Value.ToString()) == 100)
    {
        // Cell value is now 100 - make cell background red
        this.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor = System.Drawing.Color.Red;
    }
    else
    {
        // Cell value is not 100 - make background white
        this.Rows[e.RowIndex].Cells[e.ColumnIndex].Style.BackColor = System.Drawing.Color.White;
    }
}