file operation
folder operations
create folder
disk information
file reading and writing
file stream
ThreadMultithreading
Create a thread with parameters
Task multithreading
Creation method 1
The first
the second
The third method: the way of thread pool
Foreground and background threads
thread lock
Task asynchronous programming
task task cancel
task return value
async await asynchronous
Parallel library Parallel
Asynchronous method execution
Async method with return value
call and get the return value
