using static System.Console;

​

public class Program {

    public static void Main() {

        Imprime();

        WriteLine(Executa());

        WriteLine(Executa2());

    }

    public static void Imprime() => WriteLine("ok");

    public static string Executa() => "texto";

    //public static bool Teste2() => WriteLine("ok2"); return true; //daria erro

    public static string Executa2() { //é a mesma coisa

        return "texto";

    }

}