How to import data from a c# program into mssql and how to display data from a database in datagrid(wpf)?

Question

WPF

So why am I even posting this question here? Yes, because I could not find intelligible information on this issue anywhere on the Internet. Therefore, I ask you to help me find out how this is done, preferably in detail, can you tell me where to look, in general, I will be glad for any help