I'm studying c # in Windows 10 Notepad.

in using directive using Static System.Console;
I wrote WriteLine ();without System.Console, but it says assembly or it doesn't have a semicolon.
The environment is c # 5.0, but can't I write it?
By the way, there is a semicolon properly, and I changed Static S to s or changed from upper case to lower case.
How can I clear it?