C#输出字符串数据的2种方式

using System;
namespace TypeConversion
{
    class Exchange
    {

        static void Main(String[] args)
        {
            Console.Write("Enter your first name:");
            string firstName = Console.ReadLine();

            Console.Write("Enter your second name:");
            string secondName = Console.ReadLine();

            Console.WriteLine($"Your firstName is {firstName} ,and your secondName is {secondName}.");
            Console.WriteLine("Your firstName is {0} ,and your secondName is {1}.",firstName,secondName);//同上作用
        }
    }
}