Determine the version of the Windows operating system

Private voidForm1_Load (Objectsender, EventArgs e) {    if(!IsWin7 ())    {application.exit (); }}BOOLIsWin7 () {returnEnvironment.OSVersion.Version.Major = =6&& Environment.OSVersion.Version.Minor = =1;}BOOLIswinvista () {returnEnvironment.OSVersion.Version.Major = =6&& Environment.OSVersion.Version.Minor = =0;}

Some other Windows systems:

Windows Server R2
Major=6
Minor=1

Windows Server 2008
Major=6
Minor=0

Windows Server 2003
Major=5
minor=2

Windows XP
Major=5
Minor=1

Windows 2000
Major=5
Minor=0

Windows NT4
Major=4
Minor=0

Windows ME
Major=4
Minor=90

Windows 98
Major=4
minor=10

Determine the version of the Windows operating system