درخواست کد:کد C# برای اکسپرت DataGridView به اکسل؟

کد:
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.

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

            {

                string stLine = "";

                for (int j = 0; j < dGV.Rows[i].Cells.Count; j++)

                    stLine = stLine.ToString() + Convert.ToString(dGV.Rows[i].Cells[j].Value) + "\t";

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

            }

            Encoding utf16 = Encoding.GetEncoding(1254);

            byte[] output = utf16.GetBytes(stOutput);

            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();

        }