DepartmentViewModel.cs CampusAppWP8::Model::Departments::DepartmentViewModel CampusAppWP8::Model::Departments usingSystem; usingSystem.Collections.Generic; usingSystem.Collections.ObjectModel; usingSystem.Linq; usingSystem.Text; usingSystem.Threading.Tasks; usingSystem.Xml.Serialization; namespaceCampusAppWP8.Model.Departments { [XmlRoot("root")] publicclassDepartmentViewModel:BaseViewModel { [XmlArray("professorships")] [XmlArrayItem("faculty")] publicObservableCollection<FacultyModel>_faculties{get;set;} publicDepartmentViewModel() { this.Faculties=newObservableCollection<FacultyModel>(); } publicObservableCollection<FacultyModel>Faculties { get { return_faculties; } set { if(value!=_faculties) { _faculties=value; NotifyPropertyChanged("foodDays"); } } } } }