调用API的MessageBox!

using System;
using System.Runtime.InteropServices;
namespace 调用Win32的MessageBox
{
    class Class1
    {
        [STAThread]
        static void Main(string[] args)
        {
            Class1.MessageBox(0,"auto","infomation",0);

            Class1.MessageBoxA(0,"ANSI我","infomation",0);

            Class1.MessageBoxW(0,"Unicode我","infomation",0);
        }
        [DllImport("user32.dll",CharSet=CharSet.Auto)]
        public static extern int MessageBox(int hWnd,string text,string caption,uint type);

        [DllImport("user32.dll",CharSet=CharSet.Ansi)]
        public static extern int MessageBoxA(int hWnd,string text,string caption,uint type);
      
        [DllImport("user32.dll",CharSet=CharSet.Unicode)]
        public static extern int MessageBoxW(int hWnd,string text,string caption,uint type);

    }
}