public async Task <IActionResult> SupplierItem(string supplierId, int?page = 1)
{
List <ServiceReference_Item.Item> lst_ItembyCate;
lst_ItembyCate = (await itm.findItembySupIdAsync(supplierId)).ToList();
var items = (from a in lst_ItembyCate select a).AsQueryable();
ViewBag.page = page;
int pageSize = 10;
return(View(PaginatedList <ServiceReference_Item.Item> .CreateAsync(items, page ?? 1, pageSize)));
}