C# - Variables, Constants, Concatenation

using System;

namespace LearnCS
{
    class Program
    {
        static void Main(string[] args)
        {
            string name = "Natalie";
            string lastName = "Dormer";

            int someNumber = 50;

            const int voltage = 12;

            Console.WriteLine(name);
            Console.WriteLine(lastName);

            //Console.Write(name);
            //Console.Write(lastName);

            Console.WriteLine("Custom Report: " + name + " " + lastName + " something more");

            lastName = "XXX";
            Console.WriteLine(lastName);

            Console.WriteLine(someNumber);
            Console.WriteLine(voltage);      
        }
    }        
}