Windows işletim sistemi versiyonu hakkında bilgi almak

MessageBox.Show(Environment.OSVersion.ToString());



Environment.OSVersion.Version

İşletim sistemi	Versiyon
Windows 8	6.2
Windows Server 2012	6.2
Windows 7 Service Pack 1	6.1
Windows 7	6.1
Windows Server 2008 R2	6.1
Windows Server 2008	6.0
Windows Vista	6.0
Windows Server 2003 R2	5.2
Windows Server 2003	5.2
Windows XP 64-Bit Edition	5.2
Windows XP	5.1
Windows 2000	5.0

Kaynak:
http://msdn.microsoft.com/en-us/library/system.environment.osversion.aspx