How can I Serialize and Deserialize List<Contact> or ObservableCollection<Contact>

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Windows

.NET4

phone

I am writing a GroupSMS app on Windows Phone, and I want to create a group and add some contacts into it, then serialize the group to isolatedstorage file, so that I can get the group information next time when app restart. My question is how can I Serialize and Deserialize List<contact> or ObservableCollection<contact>?

And one more question, how can I get the contact update event, I mean if user update the contact information, especially the phone number, how I update the serialized data in my app's storage as well?

Thanks.