How to update the table after adding a record?

Question

C++ / C#

Studying Entity Framework and WPF, I came to a dead end. I did the same as in this article ferrum-box.blogspot.ru/2012/03/entity-framework-wp...
But here are the questions:
1. How can I make the table updated when a record is added?
2. How can I fill in the table where I have a ComboBox with data from the lookup table?

Answer 1

1. In this article, the default binding mode is one-way.
2. Run a query to the table and get the type as in step 1, bind to the ItemSource element.