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I need to sync actions from dir1 to dir2 using FileSystemWatcher. When i create a new file in dir1,the same file must be in dir2,if i delete/rename/move,in dir2 should also.
When i create the file in dir1,it is being created in dir2 also,but when i try to rename the file in dir1,i get this exception : Unhandled exception. System.IO.IOException: The process cannot access the file 'C:\Users\artio\Desktop\FASassignment\root\dir1\g.txt' because it is being used by another process. As i googled,this error may appear because the stream isn't closed,but i dont know if i work with one. Also,when i create a subfolder and a file in it,i get an error that the path isnt found and in dir2 it doesnt create,could you help me please with these two errors? Thanks in advance!
Program:

I'm learning c# and i have a task to:
Sync content of the two directories. Given the paths of the two dirs - dir1 and dir2,then dir2 should be synchronized with dir 1:

• If a file exists in dir1 but not in dir2,it should be copied
  -if a file exists in dir1 and in dir2,but content is changed,then file from dir1 should overwrite the one from dir2
  -if a file exists in dir2 but not in dir1 it should be removed
  Notes: files can be extremly large
  -dir1 can have nested folders
  hints:
  -read and write files async
  -hash files content and compare hashes not content

I have some logic on how to do this,but i dont know how to implement it.I googled the whole internet to get a point to start,but unsuccesseful.
I started with this:

The task is to implement the class decorator to add the “identify“ class method which returns a class name with the information passed in the decorator.
Example:

I have a task to implement the class decorator to add the “identify“ class method which returns a class name with the information passed in the decorator.
For example :

I am having a task to implement a functionality to create roles in JS,and each role is defining by its type (Guest, User, Admin).

1. Type Guest should have : a method which gets an array of tasks(constructor); a method which gets tasks id (the array index) and returns a task from the array of tasks(getTask) createTask should not be defined and changeType too
2. Type User also should have constructor like at Guest,also a method getTask,and createTask -a method which adds a new task to the array of tasks changeType should not be defined.
3. Type Admin should have constructor-a method which gets an array of guests and users;

getArray-a method which returns an array of guests and users

changeType-a method which gets a number (the array index) modifies the array item at the provided index (changes the object type from a guest to a user and otherwise and as a result, the tasks should migrated from one type to another), and returns a modified array of items

So,i created all classes and methods,but in the final when i test it with npm,i get the messages that :

• Guest should not implement method createTask
• Guest should not implement method changeType
• User should not implement method changeType
• Admin should change type of role from User to Guest

But when i introduce them in console in browser,everything works good,but i observed that when i write guest.createTask it shows that its undefined and doesnt throw an error,but i think i should get the error.

Here is my code: