FIX ENTITY FRAMEWORK INSERT/ UPDATE ISSUE .NETCORE 2.1

I HAVE Tbl_Packaging_Part TABLE IN SQL THAT I ALREADY IMPLEMENTED INSERT/UPDATE BUT IT NOT WORKING YOU NEED FIX IT I HAVE USED UPDATE QUERY FROM EF DBCONTEXT OR CALLED API AS WELL BUT IT DOESN'T WORK. PROJECT IS IN .NETCORE 2.1 MVC

NO TIME WASTERS. I NEED IT ASAP ALREADY ATTACHED SOURCE CODE WITH MSSQL SCRIPT IF YOU VIDEO LOOM.COM WITH SOLUTION THAT YOU HAVE FIXED ISSUE THAT CAN BE IMMEDIATE HIRING.