format datagridview cell

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C#

In the below code, I am trying to format the value of the cell inside a datagridview in windows form to have thousand separator
But the problem is that it places .00 at the end of the numbers
i.e.
it converts 123456789 to 123,456,789.00

How can I solve this please?
Thanks

private void dgv_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
        {
            if (e.ColumnIndex > 0)
            {
                if (dgv.Columns[e.ColumnIndex].Name.ToLower().Contains("summary"))
                {
                    if (e.Value.ToString() != "")
                    {
                        double d = double.Parse(e.Value.ToString());
                        e.Value = d.ToString("n");
                    }
                }
            }
        }