private void submitBtn_click(object sender, RoutedEventArgs e)
        {
            //create a new object with the parameters specified by the user
            Donor donor = new Donor()
            {
                Name      = nameBox.Text,
                Age       = ageBox.Text,
                BloodType = bloodTypeBox.Text,
            };

            if (donorList == null)
            {
                donorList.donors = storedDonorList.GetDonors();
            }

            donorList.AddDonor(donor);

            //add the object to the list since it is static the content the objects will remain the same
        }
 protected override void OnNavigatedTo(NavigationEventArgs e)
 {
     //pass the object from the mainpage
     donorList = e.Parameter as DonorManager;
     Donors    = donorList.GetDonors();
 }