I am looking for a way to store a variable for the entire existante of the app (the date when the app was last refreshed) , an equivalent of the userDefaults in objective-c iOS.
I was thinking that i could use isolatedStorage, but it doesn’t seem to be the best option considering that i am looking to store only one variable (a date string) and creating a file just for that doesn’t seem like the shortest way.
you can do this
IsolatedStorageSettings.ApplicationSettings
check this post
Windows phone 7 config / appSettings?