---
id: "P:cAlgo.API.MarketSessionChangedEventArgs.PreviousSessions"
kind: "property"
type: "T:cAlgo.API.MarketSessionChangedEventArgs"
url: "https://help.ctrader.com/ctrader-algo/references/EventArgs/MarketSessionChangedEventArgs/PreviousSessions/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# MarketSessionChangedEventArgs.PreviousSessions

Member of [MarketSessionChangedEventArgs](https://help.ctrader.com/ctrader-algo/references/EventArgs/MarketSessionChangedEventArgs/index.md).

## PreviousSessions

Returns the previous value of the MarketSessions property before the MarketSessionsChanged event was triggered. Returns MarketSession.None if no previous sessions ended when the event was triggered.

Environments: Desktop supported · CLI supported · Cloud supported.

C#:

```csharp
public MarketSession PreviousSessions {get;}
```

Python:

```python
marketSessionChangedEventArgs.PreviousSessions: MarketSession
```

### Returns

`MarketSession` — 

### Examples

C#:

```csharp
protected override void OnStart()
{
    MarketSessionsChanged += OnMarketSessionsChanged;
}

private void OnMarketSessionsChanged(MarketSessionChangedEventArgs args)
{
    if (args.PreviousSessions.HasFlag(MarketSession.NewYork) && !args.NewSessions.HasFlag(MarketSession.NewYork))
        Print("New York session has just closed");
}
```

Python:

```python
def on_start(self):
    api.MarketSessionsChanged += self.on_market_sessions_changed

def on_market_sessions_changed(self, args):
    if args.PreviousSessions.HasFlag(MarketSession.NewYork) and not args.NewSessions.HasFlag(MarketSession.NewYork):
        api.Print("New York session has just closed")
```