---
id: "E:cAlgo.API.Internals.Algo.MarketSessionsChanged"
kind: "event"
type: "T:cAlgo.API.Internals.Algo"
url: "https://help.ctrader.com/ctrader-algo/references/General/Algo/MarketSessionsChanged/"
---

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

# Algo.MarketSessionsChanged

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

## MarketSessionsChanged

Occurs when market sessions change.

Environments: Desktop supported · CLI supported · Cloud supported.

C#:

```csharp
public event Action<MarketSessionChangedEventArgs> MarketSessionsChanged;
```

Python:

```python
api.MarketSessionsChanged += handler  # handler(obj: MarketSessionChangedEventArgs)
```

### Returns

`Action<MarketSessionChangedEventArgs>` — 

### Examples

C#:

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

private void OnMarketSessionsChanged(MarketSessionChangedEventArgs args)
{
    Print("Market sessions changed from {0} to {1}", args.PreviousSessions, args.NewSessions);
}
```

Python:

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

def on_market_sessions_changed(self, args):
    api.Print(f"Market sessions changed from {args.PreviousSessions} to {args.NewSessions}")
```