经典的hello world,用+运算符实现。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            string a = "hello";
            string b = " world!";
            string c = a + b;
            Console.Write(c);
            Console.Read();
        }
    }
}