Complete Programming Language

1. Core language -  variables, functions, loops
2. Generics,Data structures and Collections.
2. Threading
3. Network reading and writing
4. Disk IO

Generics types allow code reuse with type safety
List, Queue, Stack, Hashset, SortedSet LinkedList, Dictionary, SortedDictionary, SortedList

Threadsafe : concurrent collections.
Disk IO:

A stream is a sequence of bytes that you can use to read from or write to a backing store.

• Reading all the text file from disk

            File.ReadAllText(@"C:\temp\19.json"));

• Reading large text file from Disk 

using (var sr = new StreamReader(file))

{

string line;

while ((line = sr.ReadLine()) != null)

{

    Console.WriteLine(line);

}

}