急跪求用c#将Excel指定里边区域进行PDF打印

急....跪求用c#将Excel指定里面区域进行PDF打印
跪求。。。用C#将Excel的指定某个区域进行PDF打印的实例。。急  
------解决思路----------------------
把Excel某一块转换成PDF再打印？是这个意思么。
用Spire.Xls 和Spire.PDF，添加引用到project后。
然后加入如下代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Spire.Pdf;
using Spire.Xls;
using System.Drawing;
using System.Windows.Forms;
using Spire.Pdf.Annotations;
using Spire.Pdf.Widget;
using System.Drawing.Printing;


namespace Excel_to_PDF_print
{
    class Program
    {
        static void Main(string[] args)
        {
            Workbook workbook = new Workbook();
            workbook.LoadFromFile("test.xlsx", ExcelVersion.Version2010);
            //Get the first sheet and add a new sheet to store your area.
            Worksheet sheet = workbook.Worksheets[0];
            workbook.Worksheets.Add("Newsheet");
            workbook.SaveToFile("result.xls");
            //Copy your area to new sheet.
            workbook.Worksheets[0].Range["A1:G10"].Copy(workbook.Worksheets[1].Range["A7:D11"]);
           //convert new sheet to pdf
            workbook.Worksheets[1].SaveToPdf("result.pdf", Spire.Xls.FileFormat.PDF);
            // Save and preview PDF
          
            //Print PDF
           PdfDocument doc = new PdfDocument();
           doc.LoadFromFile("result.pdf");

           //Use the default printer to print all the pages
          
           //Set the printer and select the pages you want to print

           PrintDialog dialogPrint = new PrintDialog();
           dialogPrint.AllowPrintToFile = true;
           dialogPrint.AllowSomePages = true;
           dialogPrint.PrinterSettings.MinimumPage = 1;
           dialogPrint.PrinterSettings.MaximumPage = doc.Pages.Count;
           dialogPrint.PrinterSettings.FromPage = 1;
           dialogPrint.PrinterSettings.ToPage = doc.Pages.Count;

           if (dialogPrint.ShowDialog() == DialogResult.OK)
           {
               doc.PrintFromPage = dialogPrint.PrinterSettings.FromPage;
               doc.PrintToPage = dialogPrint.PrinterSettings.ToPage;
               doc.PrinterName = dialogPrint.PrinterSettings.PrinterName;

               PrintDocument printDoc = doc.PrintDocument;
               dialogPrint.Document = printDoc;
               printDoc.Print();
           }




        }
    }
}