public async Task FixBalanceCommand() { var itemsDict = Item.GetItems(); var usersDict = MarbleBotUser.GetUsers(); var newUsersDict = new Dictionary <ulong, MarbleBotUser>(); foreach ((ulong userId, MarbleBotUser user) in usersDict !) { user.Balance = user.NetWorth - (user.Items?.Aggregate(0m, (total, itemPair) => { total += itemsDict[itemPair.Key].Price * itemPair.Value; return(total); }) ?? 0); newUsersDict.Add(userId, user); } MarbleBotUser.UpdateUsers(newUsersDict); await SendSuccessAsync("Success."); }