File manipulation using vb.net in Windows Forms applications

Purpose
We would like to perform the following operations on the target folder of BOX.
Folder creation
Uploading files
Uploading folders
Delete files

Development environment
OS : Windows7
IDE : Microsoft Visual Studio 2015
Development Language : vb.net
FrameWork : .Net Framework 4
Project type : Windows Form Application

Question
I want to operate a file from a Windows form screen without displaying the Box screen.
Also, I think that the only way to proceed is to use an application token authentication pattern that does not use the SDK as the authentication method.
I'm trying to develop with the reference guide as a guide, but due to the age of the development environment, I can't proceed as expected.
I would like to know the sequence of steps from authentication to file manipulation.

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