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I know it is a good idea to store configuration data in app.config (e.g. database connection strings) instead of hardcoing it, even if I am writing an application just for myself. But is there a way to update the configuration data stored in app.config from the program that is using it?
If you use the Settings for the project, you can mark each setting as either application or user.
If they’re set as user, they will be stored per-user and when you call the Save method it will be updated in the config for that user.
Code project has a really detailed article on saving all types of settings.