C#呼叫WinAPI

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;    //C#呼叫WinAPI

namespace ConsoleApplication2
{
    class Program
    {
        [DllImport("User32.dll", CharSet = CharSet.Unicode)]  //程式使用從 User32.dll 程式庫匯入的 MessageBox 方法
        public static extern int MessageBox(int h, string m, string c, int type);  //MessageBox既定格式

        static int Main(string[] args)
        {
            string myString;
            Console.Write("Enter");
            myString = Console.ReadLine();
            return MessageBox(0, myString, "My Message Box", 0);   //#
        }
    }
}