public async static void ClearContactData()
{
ContactBindingManager bindingManager = await ContactBindings.GetAppContactBindingManagerAsync();
ContactStore store = await ContactStore.CreateOrOpenAsync();
await store.DeleteAsync();
await bindingManager.DeleteAllContactBindingsAsync();
}
async private void Logout_Click(object sender, RoutedEventArgs e)
{
ContactBindingManager bindingManager = await ContactBindings.GetAppContactBindingManagerAsync();
await bindingManager.DeleteAllContactBindingsAsync();
// Do sign-out logic here and clear the authentication token using the AppSettings class
App.MyAppSettings.AuthTokenSetting = "";
App.MyAppSettings.UserIdSetting = "";
MessageBox.Show("Done!");
}