public void UpdateFavourites(Contact selectedContact)
        {
            foreach (Contact item in AllContactData)
            {
                if (item == selectedContact)
                {
                    AllContactData.Remove(item);
                    AllContactData.Add(selectedContact);
                    LoadLastLoadedSection();

                    break;
                }
            }
            dataService.SaveData(AllContactData); /// saves data to the hard drive
        }
        private void AddNewContact()
        {
            Contact newContact = new Contact
            {
                Name         = null,
                ImagePath    = null,
                PhoneNumbers = new string[2]
                {
                    null,
                    null
                },
                Mail        = null,
                Address     = null,
                IsFavourite = false
            };

            AllContactData.Add(newContact);
            LoadLastLoadedSection();
            dataService.SaveData(AllContactData); /// saves data to the hard drive
        }