如何把一个文本文件写入excel文档？

Excel.Application oExcel=new Excel.ApplicationClass();
object oMissing =System.Reflection.Missing.Value;
Excel.Workbook oBook =oExcel.Workbooks.Add(oMissing);
Excel.Sheets oSheets=oBook.Worksheets;
Excel._Worksheet worksheet=(Excel._Worksheet)oSheets.get_Item(1);
worksheet.Name="Main";worksheet.Cells[1,1]="电路名称";
worksheet.Cells[1,9]="操作员";oBook.SaveAs(sPath,oMissing,"","",true,false,Excel.XlSaveAsAccessMode.xlNoChange,1,false,oMissing,oMissing);
oBook.Close(false,null,null);
oExcel.Workbooks.Close();
oExcel.Quit();
System.Runtime.InteropServices.Marshal.ReleaseComObject(oSheets);
System.Runtime.InteropServices.Marshal.ReleaseComObject(oBook);
System.Runtime.InteropServices.Marshal.ReleaseComObject(oExcel);
oSheets = null;
worksheet=null;oBook = null;
oMissing=null;
oExcel = null;
GC.Collect();