private void createOutputFile(string excelFullFilename){bool isAutoFit = true;bool isHeaderBold = true;Excel.Application xlApp = new Excel.Application();Excel.Workbook xlWorkBook;Excel.Worksheet xlWorkSheet;object misValue = System.Reflection.Missing.Value;xlApp = new Excel.ApplicationClass();xlWorkBook = xlApp.Workbooks.Add(misValue);xlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1);const int excelRowHeader = 1;const int excelColumnHeader = 1;//save headerint curColumnIdx = 0 + excelColumnHeader;int rowIdx = 0 + excelRowHeader;xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "Title";xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "Description";const int constBullerLen = 5;for (int bulletIdx = 0; bulletIdx < constBullerLen; bulletIdx++){int bulletNum = bulletIdx + 1;xlWorkSheet.Cells[rowIdx, curColumnIdx + bulletIdx] = "Bullet" + bulletNum.ToString();}curColumnIdx = curColumnIdx + constBullerLen;const int constImgNameListLen = 5;for (int imgIdx = 0; imgIdx < constImgNameListLen; imgIdx++){int imgNum = imgIdx + 1;xlWorkSheet.Cells[rowIdx, curColumnIdx + imgIdx] = "ImageFilename" + imgNum.ToString();}curColumnIdx = curColumnIdx + constImgNameListLen;xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "HighestPrice";xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "OneSellerIsAmazon";xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "ReviewNumber";xlWorkSheet.Cells[rowIdx, curColumnIdx++] = "IsBestSeller";//formatting//(1) header to boldif (isHeaderBold){Range headerRow = xlWorkSheet.get_Range("1:1", System.Type.Missing);headerRow.Font.Bold = true;}//(2) auto adjust column width (according to content)if (isAutoFit){Range allColumn = xlWorkSheet.Columns;allColumn.AutoFit();}//output
            xlWorkBook.SaveAs(excelFullFilename,XlFileFormat.xlWorkbookNormal,misValue,misValue,misValue,misValue,XlSaveAsAccessMode.xlExclusive,XlSaveConflictResolution.xlLocalSessionChanges,misValue,misValue,misValue,misValue);xlWorkBook.Close(true, misValue, misValue);xlApp.Quit();crl.releaseObject(xlWorkSheet);crl.releaseObject(xlWorkBook);crl.releaseObject(xlApp);}

private void appendInfoToFile(string fullFilename, AmazonProductInfo productInfo){Excel.Application xlApp;Excel.Workbook xlWorkBook;Excel.Worksheet xlWorkSheet;object missingVal = System.Reflection.Missing.Value;xlApp = new Microsoft.Office.Interop.Excel.Application();//xlApp.Visible = true;//xlApp.DisplayAlerts = false;//http://msdn.microsoft.com/zh-cn/library/microsoft.office.interop.excel.workbooks.open%28v=office.11%29.aspxxlWorkBook = xlApp.Workbooks.Open(Filename : fullFilename,//UpdateLinks:3,ReadOnly : false,//Format : 2, //use Commas as delimiter when open text file//Password : missingVal,//WriteResPassword : missingVal,//IgnoreReadOnlyRecommended: false, //when save to readonly, will notice youOrigin: Excel.XlPlatform.xlWindows, //xlMacintosh/xlWindows/xlMSDOS//Delimiter: ",",  // usefule when is text fileEditable : true,Notify : false,//Converter: missingVal, AddToMru: true, //True to add this workbook to the list of recently used filesLocal: true,CorruptLoad: missingVal //xlNormalLoad/xlRepairFile/xlExtractData
                );//Get the first sheetxlWorkSheet = (Excel.Worksheet)xlWorkBook.Worksheets.get_Item(1); //also can get by sheet nameExcel.Range range = xlWorkSheet.UsedRange;//int usedColCount = range.Columns.Count;int usedRowCount = range.Rows.Count;const int excelRowHeader = 1;const int excelColumnHeader = 1;//int curColumnIdx = usedColCount + excelColumnHeader;int curColumnIdx = 0 + excelColumnHeader; //start from column beginint curRrowIdx = usedRowCount + excelRowHeader; // !!! here must added buildin excelRowHeader=1, otherwise will overwrite previous (added title or whole row value)
xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.title;xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.description;const int constBullerLen = 5;int bulletListLen = 0;if (productInfo.bulletArr.Length > constBullerLen){bulletListLen = constBullerLen;}else{bulletListLen = productInfo.bulletArr.Length;}for (int bulletIdx = 0; bulletIdx < bulletListLen; bulletIdx++){xlWorkSheet.Cells[curRrowIdx, curColumnIdx + bulletIdx] = productInfo.bulletArr[bulletIdx];}curColumnIdx = curColumnIdx + bulletListLen;const int constImgNameListLen = 5;int imgNameListLen = 0;if (productInfo.imgFullnameArr.Length > constImgNameListLen){imgNameListLen = constImgNameListLen;}else{imgNameListLen = productInfo.imgFullnameArr.Length;}for (int imgIdx = 0; imgIdx < imgNameListLen; imgIdx++){xlWorkSheet.Cells[curRrowIdx, curColumnIdx + imgIdx] = productInfo.imgFullnameArr[imgIdx];}curColumnIdx = curColumnIdx + imgNameListLen;xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.highestPrice;xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.isOneSellerIsAmazon;xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.reviewNumber;xlWorkSheet.Cells[curRrowIdx, curColumnIdx++] = productInfo.isBestSeller;////http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=ZH-CN&k=k%28MICROSOFT.OFFICE.INTEROP.EXCEL._WORKBOOK.SAVEAS%29;k%28SAVEAS%29;k%28TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV3.5%22%29;k%28DevLang-CSHARP%29&rd=true//xlWorkBook.SaveAs(//    Filename: fullFilename,//    ConflictResolution: XlSaveConflictResolution.xlLocalSessionChanges //The local user's changes are always accepted. //    //FileFormat : Excel.XlFileFormat.xlWorkbookNormal//);//if use above SaveAs -> will popup a window ask you overwrite it or not, even if you have set the ConflictResolution to xlLocalSessionChanges, which should not ask, should directly save
            xlWorkBook.Save();//http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=ZH-CN&k=k%28MICROSOFT.OFFICE.INTEROP.EXCEL._WORKBOOK.CLOSE%29;k%28CLOSE%29;k%28TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV3.5%22%29;k%28DevLang-CSHARP%29&rd=truexlWorkBook.Close(SaveChanges : true);crl.releaseObject(xlWorkSheet);crl.releaseObject(xlWorkBook);crl.releaseObject(xlApp);}