public void ProcessRequest(HttpContext context)
 {
     _excelMgr = new ProductItemMapExcelMgr(connectionString);
     Resource.CoreMessage = new CoreResource("ProductItemMap");
     MemoryStream ms = _excelMgr.CreateExcelTable();
     context.Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddhhmmss")));
     context.Response.BinaryWrite(ms.ToArray());
     ms.Close();
     ms.Dispose();
 }