public IActionResult Index(int pageIndex = 1, int pageSize = 10, string strKey = "")
{
List <Document> docList = documentAppService.GetPagingDocuments(pageIndex, pageSize, out int pageCount, out int itemCount);
ViewBag.Page = TablePagination.PagingHtml(pageIndex, pageSize, pageCount, itemCount, strKey);
ViewBag.PageIndex = pageIndex;
ViewBag.PageSize = pageSize;
ViewBag.Key = strKey;
return(View(docList));
}