Answer 1

The .net framework is a bunch libraries that has a lot of predefined functions. Writing it as simple as this is actually, degrading what the .net framework does.

It helps you saving a files, print text etc

By installing the .net framework on a computer.
You only need to install to the computer the application that you wrote your self. Which is a lot less to install.

https://en.wikipedia.org/wiki/.NET_Framework

for example.
If you want to read a file from the hard disk.
And you need to start without the .net framework.

A hard disk is a enormous spaces of bits 001101010101.
You don't need to know memory addresses or ways to how to access the memory.

The .net framework has a library system.io
That does all this work for you an asks just for a path

string text1 = File.ReadAllText("file.txt");

You do not realise that you use it, until you need to go without.