private void ToCsV(DataGridView dGV, string filename)

        {

            string stOutput = "";

            // Export titles:

            string sHeaders = "";



            for (int j = 0; j < dGV.Columns.Count; j++)

                sHeaders = sHeaders.ToString() + Convert.ToString(dGV.Columns[j].HeaderText) + "\t";

            stOutput += sHeaders + "\r\n";

            // Export data.


            StringBuilder sbOutput = new StringBuilder();

            for (int j = 0; j < dGV.Columns.Count; j++)
            sbOutput.AppendLine(Convert.ToString(dGV.Columns[j].HeaderText) + "\t");

            for (int i = 0; i < dGV.RowCount - 1; i++)
{

            for (int j = 1; j < dGV.Rows[i].Cells.Count; j++)
            sbOutput.Append(Convert.ToString(dGV.Rows[i].Cells[j].Value) + "\t");
            sbOutput.AppendLine();
}
            Encoding utf16 = Encoding.GetEncoding(1254);
            byte[] output = utf16.GetBytes(sbOutput.ToString());




                FileStream fs = new FileStream(filename, FileMode.Create);

                BinaryWriter bw = new BinaryWriter(fs);

                bw.Write(output, 0, output.Length); //write the encoded file

                bw.Flush();

                bw.Close();

                fs.Close();

            }