Issues on saving to isolatedStorageSettings - windows-phone-7

Question

When I am saving data(String) to isolated data storage,it was saving data successfully ,but the while retrieve data from data Storage,I a getting data of previous page.
I am having String variable in App.xaml.cs and i assign the values to it from pages,on deactivating the app,information abt last page gets saved and when i restore it ,i should get my saved String,But this is place i am getting this issue,I get some time the previous or before pages values,If i delete the app and build app successfully it works successfully,but when withou deleting the app and when going on doing build and build process,I am getting this issue.
if (IsolatedStorageSettings.ApplicationSettings.Contains("endResponse"))
{
IsolatedStorageSettings.ApplicationSettings[endResponse] = App.endResponse;
}
else
{
settings.Add("endResponse", App.endResponse);
}
and for retreiving i am using
if (IsolatedStorageSettings.ApplicationSettings.Contains("endResponse"))
{
IsolatedStorageSettings.ApplicationSettings.TryGetValue<String>("endResponse", out App.endResponse);
}
Debug.WriteLine("App.end Response in IsolatedStorage while activation>>>" + App.endResponse);
When deleting the app from simulator and while testing the app,it works well ,apart from it I am not getting exact values always.
I am attaching the screenshot of issue,plz check and tell me ,if i miss anything.

Answer 1

After writing your settings, you need to call the Save method :-
http://msdn.microsoft.com/en-us/library/system.io.isolatedstorage.isolatedstoragesettings.save%28v=vs.95%29.aspx

Answer 2

Shouldn't you use
IsolatedStorageSettings.ApplicationSettings["endResponse"]
rather then this in your post?
IsolatedStorageSettings.ApplicationSettings[endResponse]