public async void OnEnteredActivityDate(string memo)
{
var item = new ActivityDateItem()
{
ActivityId = mActivityId,
Memo = memo,
Date = DateTime.Now
};
var resItem = await mSqlite.AddActivityDateAsync(item);
if (resItem != null)
{
mViewHolder.ListAdapter.Insert(resItem, 0);
UpdateElapsedDate();
ToastManager.ShowLongTime(Activity, Resource.String.toast_success_added_activity_date);
}
else
{
ToastManager.ShowLongTime(Activity, Resource.String.toast_failed_added_activity_date);
}
}