using System;
namespace lesson11
{
    class program
    {
        static void Main(string[] args)
        {
            #region 1
            string customerName = "张三";
            Console.WriteLine("你好"+customerName);

            Console.WriteLine("你好{0}", customerName);

            string str = string.Format("你好{0}", customerName);
            Console.WriteLine(str);
            #endregion

            #region 2

            #endregion
        }
    }
}