Application.ProductVersion Property
Gets the product version associated with this application.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Typically, a version number displays as major number.minor number.build number.private part number. You can set it explicitly by setting the assembly version within your assembly manifest. For more information, see Assembly Manifest.
ProductVersion first looks to see if the assembly containing the main executable has the AssemblyInformationalVersion attribute on it. If this attribute exists, it is used for both ProductVersion and CommonAppDataPath. If this attribute does not exist, both properties use the version of the executable file instead.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.