Why are my application settings not getting persisted?

User settings are specific to the user, so they wouldn’t get saved back to the .exe.config file, which is system wide.

From the docs of LocalSettingsProvider:

Application-scoped settings and the
default user-scoped settings are
stored in a file named
application.exe.config, which is
created in the same directory as the
executable file. Application
configuration settings are read-only.
Specific user data is stored in a file
named username.config, stored under
the user’s home directory.

So for a UserSettingsTest application just run from VS under the debugger (hence the vshost bit) I ended up with a path of:

C:\Users\Jon\AppData\Local\UserSettingsTest
  \UserSettingsTest.vshost.e_Url_pdqoppugkz1vaawbhwkkcu5ibxpi2fgu
  \1.0.0.0\user.config

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