private bool UploadAndImportExcelFile()
        {
            if (excelFileUpload.HasFile)
            {
                ClearUploadedSheets();

                // Parse and read data from excel file
                try
                {
                    ExcelParser parser   = new ExcelParser(excelFileUpload.FileContent, excelFileUpload.FileName);
                    Workbook    workbook = parser.GetWorkBook();
                    UploadedSheets = GetSheets(workbook);
                }
                catch (Exception ex)
                {
                    ExcelParseEventArgs arg = new ExcelParseEventArgs();
                    arg.IsSuccessful = false;
                    arg.Message      = string.Format("{0}  Please check file format.", ex.Message);
                    if (ExcelParsing != null)
                    {
                        ExcelParsing(this, arg);
                    }

                    return(false);
                }

                return(true);
            }
            else
            {
                AlertMessages("Please input excel file.");
                return(false);
            }
        }