How to upload an Excel file and extract emails from it?

@Html.EJ().Uploadbox("UploadDefault").SaveUrl(Url.Content("~/FileUpload/SaveDefault")).ExtensionsAllow(".xls,.xlsx").RemoveUrl(Url.Content("~/FileUpload/RemoveDefault")).AutoUpload(true).

private List<MailData> ConvertData(string file)

         {

             List<MailData> list = new List<MailData>();

             ExcelEngine excelEngine = new ExcelEngine();           

             IWorkbook workbook = excelEngine.Excel.Workbooks.Open(file);

             IWorksheet worksheet = workbook.Worksheets[0];

             for (int column = 1; column <= worksheet.UsedRange.LastColumn; column++)

                 if (worksheet.Range[1, column].Value.ToLower() == "mailid")

                     for (int row = 2; row <= worksheet.UsedRange.LastRow; row++)

                         list.Add(new MailData() { MailID = worksheet.Range[row, column].Value.ToString() });

             workbook.Close();

             excelEngine.Dispose();

             return list;

         }

@Html.EJ().Uploadbox("UploadDefault").SaveUrl(Url.Content("~/FileUpload/SaveDefault")).ExtensionsAllow(".xls,.xlsx").RemoveUrl(Url.Content("~/FileUpload/RemoveDefault")).AutoUpload(true).ClientSideEvents(e=>e.Error("onError").Complete("onSuccess")).ClientSideEvents(e=>e.Complete("onSuccess"))

  function onSuccess(args) {

        if (args.responseText != "")

        {

            $("#maildata").ejListBox({ dataSource: JSON.parse(args.responseText), fields: { text: "MailID" }, height: "200" });

            $("#details").html("");

            $("#header").html("E-Mail ID Lis:");

        }

    }