public CourseCatalog()
{
_data = new ObservableCollection <Course>();
_source = new WebAPISource <Course>("http://localhost:2726", "Courses");
}
public TeacherCatalog()
{
_data = new ObservableCollection <Teacher>();
_source = new WebAPISource <Teacher>("http://localhost:2726", "Teachers");
}
public StudentCatalog()
{
_data = new ObservableCollection <Student>();
_source = new WebAPISource <Student>("http://localhost:2726", "Students");
}