A bit of a beginner's attempt at C #

This is the first C # program I made, and the teacher in the class to tell the same example, but in the course of practice I also found some problems. For example, in this case, the statement that sets the foreground and background colors will change with the color of all the fonts before "Hello World". What if these two words are behind it? The result of the attempt is this

Isn't it a little weird? My guess is that the foreground and background color of the console is its own property, and the color of all fonts that are entered after Setup is changed. It turns out that this is true ...

Just a little bit of discovery, follow the wonderful attention.

A bit of a beginner's attempt at C #