How to add new data to the database, through a WPF form in C#?

Question

SQL

Hello, I've run into a problem. There is a ComboBox cell in the data filling form, from which the names of the manufacturer (Name) of the string type should fall out from one table and be added to another under their ID (ManufacturerID), how to do this

Answer 1

I just don't know.
Each cell has a bunch of events, including onchange.
Your task is to control these messages and do something.
In general, there are 2 strategies, the
first one you save at the time of input (well, so-so) the
second one checks what has changed and if the line is lost, output something like save the changes
In any case, you get strings, date numbers, then bring them into the desired form and throw them on the backend