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.

The following code example gets this property and displays its value in a text box. The example requires that textBox1 has been placed on a form.

 Private Sub PrintProductVersion()
    textBox1.Text = "The product version is: " & _
       Application.ProductVersion
 End Sub

private void PrintProductVersion() {
    textBox1.Text = "The product version is: " +
       Application.ProductVersion;
 }

private:
   void PrintProductVersion()
   {
      textBox1->Text = "The product version is: {0}",
         Application::ProductVersion;
   }

.NET Framework

.NET Framework Client Profile

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference