How to insert/update/delete in more than one table in asp do

There are many ways to do that. You could use ADO.NET or ORM such as Entity Framework to perform CRUD operations. Just learn the basic and you should be able to do whatever you want with your database.

 

 He're an example using EF: https://www.c-sharpcorner.com/article/entity-framework-basic-guide-to-perform-fetch-filter-insert-update-and-dele/