export datagridview to csv - remove last character in row

how do i remove the last delimiter in a row when it exports the data to a csv file? i have a ; at the end.

private void btnExport_Click(object sender, EventArgs e)
        {
            //don't append ; at end of row
            System.IO.StreamWriter streamWriter = new System.IO.StreamWriter(@"C:\Projects\Excel\csvExported.csv");
            string strHeader = "";
            for (int i = 0; i < dgvConverted.Columns.Count; i++)
            {
                strHeader += dgvConverted.Columns[i].HeaderText + ";"; //use ; instead of ,
            }
            //streamWriter.WriteLine(strHeader); //don't write headers
            for (int m = 0; m < dgvConverted.Rows.Count; m++)
            {
                string strRowValue = "";
                for (int n = 0; n < dgvConverted.Columns.Count; n++)
                {
                    strRowValue += dgvConverted.Rows[m].Cells[n].Value + ";"; //use ; instead of ,
                }
                streamWriter.WriteLine(strRowValue);
            }
            streamWriter.Close();
        }

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