Upgrade Code Dialog Box
Specifies a globally unique identifier (GUID) for the UpgradeCode property of an installer.
Caution UpgradeCode should only be set for the first version; it should never be changed for subsequent versions of the application, nor should it be changed for different language versions.
To access the Upgrade Code dialog box, select the UpgradeCode property in the Properties window when a deployment project is selected in Solution Explorer.
Upgrade Code
Specifies the UpgradeCode property for the selected installer.Caution To ensure a unique UpgradeCode, you should never manually edit the GUID. Instead you should use the New Code button to automatically generate a unique GUID.
New Code
Generates a new UpgradeCode property for the selected installer.