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The windows version information

// Code from  // A Programmer's Introduction to C# 2.0, Third Edition // copyright 2000 Eric Gunnerson using System; using System.Runtime.InteropServices; unsafe struct OSVERSIONINFO {      public uint dwOSVersionInfoSize;        public uint dwMajorVersion;        public uint dwMinorVersion;        public uint dwBuildNumber;      public uint dwPlatformId;       public fixed char szCSDVersion[128]; } class Program{      [DllImport("Kernel32.dll", CharSet = CharSet.Unicode)]      static extern bool GetVersionEx(ref OSVERSIONINFO lpVersionInfo);      unsafe static void Main(string[] args)      {           OSVERSIONINFO versionInfo = new OSVERSIONINFO();           versionInfo.dwOSVersionInfoSize = (uint)sizeof(OSVERSIONINFO);           bool res = GetVersionEx(ref versionInfo);           Console.WriteLine(Marshal.PtrToStringUni(new IntPtr(versionInfo.szCSDVersion)));      } } S