在.NET中Excel怎么添加多个Sheet

            System.Reflection.Missing miss = System.Reflection.Missing.Value;  
            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.ApplicationClass();

            Microsoft.Office.Interop.Excel.Workbooks books = (Microsoft.Office.Interop.Excel.Workbooks)excel.Workbooks;

           // Microsoft.Office.Interop.Excel.Workbook book = (Microsoft.Office.Interop.Excel.Workbook)(books.Add(miss));
            Microsoft.Office.Interop.Excel.Workbook book = books.Add(XlWBATemplate.xlWBATWorksheet);

            for (int i = 1; i < 6; i++)
            {

               // Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.ActiveSheet;

                Microsoft.Office.Interop.Excel.Worksheet newWorksheet;
                newWorksheet = (Microsoft.Office.Interop.Excel.Worksheet)book.Worksheets.Add(miss, miss, miss, miss);
                newWorksheet.Name = "test" + i.ToString();

            }
           excel.Visible = true;