Q: where is the correct location for Data folder in developing process C# deskTop app i write desktop app in C# .... this app will auto generate an C/C++ code for an embededd system project
so i have to copy some pre_writen drivers to the target folder (where the file is generated)
the problem is i don't know where i can correctly put the sourc driver in !! 
for now i put the source driver in in the project foldr and i refrance it in my code lik
            // projectfolder\bin\Debug\netcoreapp3.1\file.exe
            string path = (Assembly.GetExecutingAssembly().Location);
            DirectoryInfo exeDir = new DirectoryInfo(path);
            DirectoryInfo projectDir = exeDir.Parent.Parent.Parent.Parent;
            // now i can get the driver foler like this
            string DriverPath = Path.Combine(projectDir.fullName,"drivers");

i guss that folder in the product level will be in C:\ProgramData
 but for developing where the location shoud be in ?

A: The default location in a c# dekstop app in Environment.CurrentDirectory + "\\Folder"

A: This is mostly a question of how often the data will change. And how that will interact with the very strict management of write rights since NTFS became common (While the rule predates NTFS, with mostly FAT - and thus no rights to stop us - few programmers cared).
You can and even should put stuff into the Programm directory itself, if it does not change outside of Programm Updates/Reinstallations. If it only changes with a Installer or Updater - things that need administrative rights for their work anyway - it belong there.
If changes happen more often then that - especially stuff that can change at runtime or even needs to change at runtime - where the programm folder becomes unuseable. In this case the programm directory should at tops include a template file. Something you can copy to the real directory as a baseline, to have something to start working with. As for where to put this changeable data, look at the SpecialFolders Enumeration. The Userprofile - particulary Appdata folders are the point to look at. Wich specific one to use is a question of how you want it to interact with Domain Controler Synchronisation (Roaming vs non-Roaming user). Or if you want it to end up in Common.
Drivers sound like that rare case, where the programm directory is entirely fitting. Optionally you could have the drivers installed as a parallel application. Something that can be managed/updated seperately and is simply a requirement for your programm. Something that might be shared across multiple applications.

A: In Windows there are different types of data that may be consumed by an Application such as


*

*Application Properties
Application settings enable you to store application information dynamically. Settings      allow you to store information on the client computer that should not be included in the application code. 
Ex: Position, Font, Styles, User Configuration
File Type: App.Config(Is created at design time and is by default put into BIN folder) and User.Config (Created at run time)
Project > Add New Item > Installed > Visual C# Items > Application Configuration File
 


*

*Application Data
Contains all the data, settings, and user files that are required by the installed software and UWP apps. These are user agnostic data.
Ex: Images, Resources, Sprites, Data Templates, txt files. It may also contain App.Config files
File Location: C:\ProgramData Environment.SpecialFolder.CommonAppData



*

*User Data
Contain all data that is user specifc, such as his/her app specific settings.
Ex: Any type of data
File Location: C:\Users\[USERNAME]\AppData\Roaming Environment.SpecialFolder.AppData or Environment.SpecialFolder.MyDocuments


i guss that folder in the product level will be in C:\ProgramData but
  for developing where the location shoud be in ?

yes, it will go to ProgramData, but during the development you can have it in your BIN folder or a directory of your choice if it matters
However most of the above will come into picture when you package your App to an MSI and bundle in all the dependency files and where they need to go.


EDIT
Based on the OPs clarification in comments, .CPP files will automatically go into the BIN/Debug Folder of your C# app.
 You will need to  dynamically place your device drives in the directory where your exe is running 
To access the directory where your app is running : 
string exePath = System.Reflection.Assembly.GetExecutingAssembly().Location
Output of Path = Absolute path where your exe is running 
C:\Users\User1\source\repos\Test\Test\bin\Debug\Test.exe
string exeDirectory = Path.GetDirectoryName(exePath);
The Directory path where your exe is situated
C:\Users\User1\source\repos\Test\Test\bin\Debug
