Do you put curly braces?

Question

C++ / C#

I understand the question is strange, but I don’t know what is better when you need to perform one action with a condition.
For example:

if(any)
     {
            // строка кода
     }

Or like this:

if(any)
          // строка кода

In Sroustrup's examples, nothing on this topic is clear - in some cases he uses curly braces after the condition, even if only one action needs to be performed, in others he does not.
Beauty or conciseness?

Answer 1

The rule of good form is the setting of curly braces in any case. For inspiration, you can read this article: The exceptional beauty of Doom 3 source code

Answer 2

if(any) {
    // строка кода
}

Answer 3

if(any) // строка кода ;
?