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Saving a setting to SharedPreferences doesn't work.
prefs = PreferenceManager.GetDefaultSharedPreferences(ctx);
Log.Debug("AAAAAA", prefs.GetString("PORT", "ERROR"));
In this example, "ERROR" is displayed.
Using the DDMS in the emulator I can see the sharedpreference file is made, but it's an empty XML file:
<?xml version='1.0' encoding='utf-8' standalone='yes' ?>
The problem is that ISharedPreferences.Edit() is returning a new instance every time it's called, and the changes aren't saved _unless_ you call ISharedPreferencesEditor.Commit() on that instance.
If you fix your code to do the following, it will work:
var prefs = PreferenceManager.GetDefaultSharedPreferences (this);
var editor = prefs.Edit ();
editor.PutString ("PORT", "80");
Log.Debug ("*jonp*", prefs.GetString ("PORT", "ERROR"));