How to export winform datagrid to word landscape?

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WinForms

MS-Word

In the following code I am able to export to word in A4 size. There are many headers in datagrid and so the A4 size does not look nice because the headers are in 2 lines. How to export in landscape size to make the layout look easily readable.

private void btnPrint_Click(object sender, EventArgs e)
        {
         //   printDocument1.Print();
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "Word Documents (*.doc)|*.doc";
            sfd.FileName = "time.doc";
            if (sfd.ShowDialog() == DialogResult.OK)
            {
                //ToCsV(dataGridView1, @"c:\export.xls");
                ToCsV(gvUserInfo, sfd.FileName); // Here dataGridview1 is your grid view name
            }
        }

        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();
        }