public IActionResult update_mash(string product, string material, string mash_id)
{
MashModel ms = new MashModel();
ms.mash_id = mash_id;
ms.mash_ref_product_id = product;
ms.mash_ref_material_id = material;
ms.update_mash();
return(RedirectToAction("mash", "Mash"));
}
