'Unable to get the copy property of the worksheet class'

private void CopyTotalsSheet()

private void cmdArchiveSheets_Click(object sender, EventArgs e)
        {
            CreateArchiveFile();
            CopyTotalsSheet();
            MoveSheets();
        }


        private void CreateArchiveFile()
        {
            string strYear;

            //Select the second sheet in the Food Pantry Workbook
            frmFoodPantry.theWorkbook.Worksheets[2].Select();

            //Get the second sheet as this will be the first datasheet
            Excel.Worksheet excelSheet = frmFoodPantry.theWorkbook.ActiveSheet;

            //Get the name of the sheet
            strYear = excelSheet.Name;

            //Parse out the year
            strYear = strYear.Substring(strYear.Length - 4);

            //Create the archive file name
            strArchiveFileName = archivePath + @"Food Pantry Registry " + strYear + ".xlsx";

            //Convert the file name to an object
            Object objString = strArchiveFileName;

            string strSourceFile = (archivePath + "Food Pantry Registry Template.xlsx");
            strDestinationFile = strArchiveFileName;

            //Copy the template workbook
            sourceWorkbook = objArchive.Workbooks.Open(strSourceFile);
            sourceWorkbook.SaveAs(strDestinationFile);
            sourceWorkbook.Close();
            destinationWorkbook = objArchive.Workbooks.Open(strDestinationFile, misValue, false);

        }
        private void CopyTotalsSheet()
        {
            
            Excel.Sheets sheets = frmFoodPantry.theWorkbook.Worksheets;
            Excel.Worksheet worksheet = (Excel.Worksheet)sheets.get_Item(1);

            //Unprotect the Totals sheet
            worksheet.Unprotect();

           // worksheet.Copy(destinationWorkbook.Worksheets[1]);

            frmFoodPantry.theWorkbook.Worksheets.Select(1);
            //destinationWorkbook.Worksheets.Select(1);
            //destinationWorkbook.Worksheets.Select("Totals");
            //destinationWorkbook.Worksheets["Totals"].Copy(frmFoodPantry.theWorkbook.Worksheets[1]);
            //frmFoodPantry.theWorkbook.Worksheets[1].Copy(destinationWorkbook.Worksheets[1]);
            frmFoodPantry.theWorkbook.Worksheets["Totals"].Copy(destinationWorkbook.Worksheets[1]);
        }

 //Unprotect the Totals sheet
 worksheet.Unprotect();

// worksheet.Copy(destinationWorkbook.Worksheets[1]);

 frmFoodPantry.theWorkbook.Worksheets.Select(1);
 //destinationWorkbook.Worksheets.Select(1);
 //destinationWorkbook.Worksheets.Select("Totals");
 //destinationWorkbook.Worksheets["Totals"].Copy(frmFoodPantry.theWorkbook.Worksheets[1]);
 //frmFoodPantry.theWorkbook.Worksheets[1].Copy(destinationWorkbook.Worksheets[1]);
 frmFoodPantry.theWorkbook.Worksheets["Totals"].Copy(destinationWorkbook.Worksheets[1]);