Newbie question to understand scripting c#

Question

So how would this be written into a working script? When I type the script it says
..\Playground\(24,1): error CS1022: Type or namespace definition, or end-of-file expected

int a = 8;
int b = ++a;
if(a > 5)
b -= 3;
else
b = 9;
Console.WriteLine(b);

Answer 1

Look at which symbol is in first place in the line 24. I think there's a superfluous curly brace. And check for the method Main.