saving data in datagridview to a word file..

private void button3_Click(object sender, EventArgs e)
        {
            Excel.Application xlApp;
            Excel.Workbook xlWorkBook;
            Excel.Worksheet xlWorkSheet;
            object misValue = System.Reflection.Missing.Value;

            xlApp = new Excel.ApplicationClass();
            xlWorkBook = xlApp.Workbooks.Add(misValue);
            xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);
            int i = 0;
            int j = 0;

            for (i = 0; i <= dgv1.RowCount - 1; i++)
            {
                for (j = 0; j <= dgv1.ColumnCount - 1; j++)
                {
                    DataGridViewCell cell = dgv1[j, i];
                    xlWorkSheet.Cells[i + 1, j + 1] = cell.Value;
                }
            }

            xlWorkBook.SaveAs("csharp.net-informations.xls", Excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue);
            xlWorkBook.Close(true, misValue, misValue);
            xlApp.Quit();

            releaseObject(xlWorkSheet);
            releaseObject(xlWorkBook);
            releaseObject(xlApp);

            MessageBox.Show("Excel file created , you can find the file c:\\csharp.net-informations.xls");
       
        }

private void button5_Click(object sender, EventArgs e)
     {
         TextWriter tw = new StreamWriter("gridviewcontent.doc");

         for (int x = 0; x < dgv1.Columns.Count; x++)
         {
             tw.Write(dgv1.Columns[x].HeaderText);
             if (x != dgv1.Columns.Count - 1)
             {
                 tw.Write(", ");
             }

         }

         tw.WriteLine();

         //writing the data
         for (int x = 0; x < dgv1.Rows.Count - 1; x++)
         {
             for (int y = 0; y < dgv1.Columns.Count; y++)
             {
                 tw.Write(dgv1.Rows[x].Cells[y].Value);
                 if (y != dgv1.Columns.Count - 1)
                 {
                     tw.Write(", ");
                 }
             }
             tw.WriteLine();
         }
         tw.Close();
     }

protected void btnExport_Click(object sender, EventArgs e)
{

    gvPaidtoSNA.ExportSettings.IgnorePaging = true;
    gvPaidtoSNA.ExportSettings.OpenInNewWindow = true;
    gvPaidtoSNA.MasterTableView.ExportToWord;

}