private void SearchTextboxViewModel_SearchedTextChangedDelayedEvent(object sender, string searchedText)
        {
            ContactListViewModel contactListViewModel = this.ViewModel as ContactListViewModel;

            if (contactListViewModel == null)
            {
                return;
            }

            contactListViewModel.SearchContact(searchedText);
        }
        private void LoadContactListData()
        {
            ContactListViewModel contactListViewModel = this.ViewModel as ContactListViewModel;

            if (contactListViewModel == null)
            {
                return;
            }

            contactListViewModel.LoadData();
        }