How to make a ban on editing a file for the second user if it was opened by the first user?

Question

.NET

How to do it more logically and rationally? There is a
file
If the first user opened it for editing, the second one can open it only for reading
edit
What more reasonable suggestions do you have?

Answer 1

https://msdn.microsoft.com/en-us/library/system.io... - the value of this parameter must be set to Read. It is not necessary to fence bicycles, it is worth studying the standard library.