Read a very large Excel file using SAX parser

Hi All,

I have a very large Excel file (Column A - By) anf around 1 Lac rows.

My objective is to read this is Asp.net in a fastest way without impacting the performance.

For that, I created a sample console app and used SAX based approach and I was able to read pretty fast.

Problem is that, when I added the code in my asp.net, it is taking ages to even read the values.

I would be interested to know: in the fastest way to read an Excel file and convert the data into XML format from an asp.net app. Any readymade sample would really help.

Here is my code: (Please note that the following code works from console app  great but performance really degrades when moved to asp.net app)

System;

System.Collections.Generic;

System.Linq;

System.Web;

System.Web.UI;

System.Web.UI.WebControls;

DocumentFormat.OpenXml;

DocumentFormat.OpenXml.Packaging;

OO=DocumentFormat.OpenXml.Spreadsheet;

System.Diagnostics;

WebApplication1

publicpartialclass_Default:Page

protectedvoidPage_Load(objectsender,EventArgse)

Stopwatchwatch =newStopwatch();

StringfileName =@"C:\Users\ankushb\Desktop\TestData_Eligibility_File.xlsx";

// Comment one of the fo    llowing lines to test the method separately.

//ReadExcelFileDOM(fileName);    // DOM

// SAX

publicvoidReadExcelFileSAX1(stringfileName)

List<string> listShared = newList<string>();

using(SpreadsheetDocumentxl = SpreadsheetDocument.Open(fileName,false))

SharedStringItemssi;

using(OpenXmlReaderoxrShared = OpenXmlReader.Create(xl.WorkbookPart.SharedStringTablePart))

while(oxrShared.Read())

if(oxrShared.ElementType ==typeof(OO.SharedStringItem))

SharedStringItem)oxrShared.LoadCurrentElement();

// this assumes the shared string is a simple text format, instead of rich text.

WorksheetPartwsp = xl.WorkbookPart.WorksheetParts.First();

Cellc;

using(OpenXmlReaderoxrCells = OpenXmlReader.Create(wsp))

while(oxrCells.Read())

if(oxrCells.ElementType ==typeof(OO.Cell))

Cell)oxrCells.LoadCurrentElement();

//  c = (OO.Cell)oxrCells.LoadCurrentElement();

// c.CellReference holds a string such as "A1"

if(c.DataType !=null)

if(c.DataType == OO.CellValues.SharedString)

// use whichever from-string-to-number conversion

// you like.

Console.Write(listShared[Convert.ToInt32(c.CellValue.Text)]);

//listShared[Convert.ToInt32(c.CellValue.Text)];

elseif(c.DataType == OO.CellValues.Number)

// "normal" value

//c.CellValue.Text;

// there's also boolean, which you might be interested

// as well as other types

else

// is by default a Number. Use this:

//c.CellValue.Text;