Configuring Applications Using Dynamic Properties
The user interface for dynamic properties has been removed from Visual Studio. However, dynamic properties are still supported. If you import a project from an earlier version of Visual Studio, the dynamic properties settings will be preserved in code and will work at run time. We recommend that you instead use the Project Designer to specify application settings. For more information, see Managing Application Settings.
With dynamic properties you can store some of an application's property values to an external file and load them when the application runs. This allows you to make changes to property values without recompiling the application, after your project has been deployed.