Time and Sales - monitor trade volume update

[er111222]

if (e.MarketDataType == MarketDataType.Last)
{
tradePrice = e.Price;
tradeQty = e.Volume;
}

How to set up the condition:
if(tradeQty has been updated)
{
do something;
}

I am thinking to do it like this:
if(tradeQty != e.Volume && the current time != the last time)

but how to compare the time value?
Or any other way to do this?

[NinjaTrader_Bertrand]

er111222, so you wish to track a new trade that would not have the volume / qty of the last 'Last' update? As if you were just looking for a new trade taking place, that would be seen in Last event update call alone. e.Time could also be accessing in OnMarketData, so you could save the last event time to a variable as well and compare for your condition.