How to create an adjacency matrix in WPF/Windows Forms?

Question

WPF

I want to make a form in which the user can set the number of vertices n .
A table n * n is being built , in which the user will have to write some numeric values.
The problem is that I don't understand how exactly to do it, in code. I read various answers to questions, videos, but for some reason this was not found anywhere

Answer 1

on top comes a container with an input
from below with a table
www.wpftutorial.net/DataGrid.html
when you enter, a table N x N + 1 is created, then you set the
names of the headers and the names of 1 column
in the DataGrid, set the id and do it all in CodeBehaind.
All other cells fill with text boxes