Where is system.io ?

Question

c sharp problem

Answer 1

It is still there.
Add
using System.IO;
to the other using statements.
And you can use its functionality.
What functionality are you looking for ?

C# is case sensitive and IO is uppercase.
https://msdn.microsoft.com/en-us/library/system.io(v=vs.110).aspx

Answer 2

thank you but i mean where it in cource

Answer 3

course or source

Answer 4

course

Answer 5

It is not in the course because it is functionality and not a concept.

In this link is lots of basic information
https://www.dotnetperls.com/path

What do you want to do.