Fast Exporting from Dataset and more than 65536 rows

Important:    outputPath file extention must be xls. like "Test.xls" Because In excel 2007 (office 12), while it is writing to file (at SaveAs) Compatibility Checker opens and ask me to continue. i Used excelApp.DisplayAlerts = false; but when i open excel document, i saw just 65536 rows.

public static void ExportToExcel(DataSet dataSet, string outputPath)
    {
  
        System.Type moAppType;
        // if u use excell 2003 and 2007 on same project, make sure true object u loaded.
        moAppType = System.Type.GetTypeFromProgID("Excel.Application.12");
       
       // xlApp = (Excel.Application)moApp;
        // Create the Excel Application object
        Application excelApp = (Microsoft.Office.Interop.Excel.Application)System.Activator.CreateInstance(moAppType);
        excelApp.DisplayAlerts = false;
        
 
        // Create a new Excel Workbook
        Workbook excelWorkbook = excelApp.Workbooks.Add(Type.Missing);
 
        int sheetIndex = 0;
 
        // Copy each DataTable
        foreach (System.Data.DataTable dt in dataSet.Tables)
        {
 
            // Copy the DataTable to an object array
            object[,] rawData = new object[dt.Rows.Count + 1, dt.Columns.Count];
 
            // Copy the column names to the first row of the object array
            for (int col = 0; col < dt.Columns.Count; col++)
            {
                rawData[0, col] = dt.Columns[col].ColumnName;
            }
 
            // Copy the values to the object array
            for (int col = 0; col < dt.Columns.Count; col++)
            {
                for (int row = 0; row < dt.Rows.Count; row++)
                {
                    rawData[row + 1, col] = dt.Rows[row].ItemArray[col];
                }
            }
 
            // Calculate the final column letter
            string finalColLetter = string.Empty;
            string colCharset = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
            int colCharsetLen = colCharset.Length;
 
            if (dt.Columns.Count > colCharsetLen)
            {
                finalColLetter = colCharset.Substring(
                    (dt.Columns.Count - 1) / colCharsetLen - 1, 1);
            }
 
            finalColLetter += colCharset.Substring(
                    (dt.Columns.Count - 1) % colCharsetLen, 1);
 
            // Create a new Sheet
            Worksheet excelSheet = (Worksheet)excelWorkbook.Sheets.Add(
                excelWorkbook.Sheets.get_Item(++sheetIndex),
                Type.Missing, 1, XlSheetType.xlWorksheet);
 
            excelSheet.Name = dt.TableName;
            
 
            // Fast data export to Excel
            string excelRange = string.Format("A1:{0}{1}",
                finalColLetter, dt.Rows.Count + 1);
 
            excelSheet.get_Range(excelRange, Type.Missing).Value2 = rawData;
 
            // Mark the first row as BOLD
            ((Range)excelSheet.Rows[1, Type.Missing]).Font.Bold = true;
        }
       
        // Save and Close the Workbook
        
        excelWorkbook.SaveAs(outputPath, XlFileFormat.xlExcel12, Type.Missing,
            Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlExclusive,
            Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
        excelWorkbook.Close(true, Type.Missing, Type.Missing);
        excelWorkbook = null;
 
        // Release the Application object
        excelApp.Quit();
        excelApp = null;
 
        // Collect the unreferenced objects
        GC.Collect();
        GC.WaitForPendingFinalizers();
 
    }