"Interlayer" between business logic and database. MongoDB C# .NET?

Question

MongoDB

Please tell me an example of the correct implementation of the "layer" class between the MongoDB database and the business logic of the application.
Interested in how to properly store and work with objects: Mongo server, collections and grids. Implementation of the CRUD model and queries.
As an example, it would be ideal: links to open-source projects, articles, files or class code in the same pastebin. Please do not provide links to dry excerpts from the documentation for the MonogDB drivers for .NET or to articles from the category of getting started.
Thank you.

Answer 1

habrahabr.ru/blogs/net/115311/
handcraftsman.wordpress.com/2010/02/20/mongodb-csharp-quickstart/
www.mattlong.com.au/?p=206

Answer 2

www.amazon.com/Business-Management-Service-Oriented-Architecture/dp/0470027215
www.amazon.com/Business-Rules-Applied-Building-Approach/dp/0471412937

Answer 3

The design patterns are the same everywhere, I don’t understand what could be the difference between the database, except that in MongoDB you need to write more on the application server side. What kind of “business logic” patterns are, in the terminology of patterns, for some reason I have not heard this, please explain because Google did not give an answer.
Here's what I can offer on the topic.
ISBN 978-5-469-01136-1
PS: I'm surprised you don't know about this book. because I immediately found it at your request.