public async Task DownVote()
{
if (IsUpVoted)
{
IsUpVoted = false;
Points--;
}
string toVote;
if (IsDownVoted)
{
toVote = "veto";
Points++;
}
else
{
if (IsUpVoted)
Points++;
toVote = "down";
Points--;
}
IsDownVoted = !IsDownVoted;
await Gallery.Vote(Id, toVote);
}