---
id: "E:cAlgo.API.BacktestingDataRequest.StatusChanged"
kind: "event"
type: "T:cAlgo.API.BacktestingDataRequest"
url: "https://help.ctrader.com/ctrader-algo/references/Plugin/Backtesting/DataSource/BacktestingDataRequest/StatusChanged/"
---

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

# BacktestingDataRequest.StatusChanged

Member of [BacktestingDataRequest](https://help.ctrader.com/ctrader-algo/references/Plugin/Backtesting/DataSource/BacktestingDataRequest/index.md).

## StatusChanged

Occurs when request status is changed.

Environments: Desktop supported · CLI not supported · Cloud not supported.

- CLI: Available to plugins only, and plugins cannot run in the CLI.
- Cloud: Available to plugins only, and plugins cannot run in the cloud.

C#:

```csharp
event Action<BacktestingDataRequestStatusChangedEventArgs> StatusChanged;
```

Python:

```python
backtestingDataRequest.StatusChanged += handler  # handler(obj: BacktestingDataRequestStatusChangedEventArgs)
```

### Returns

`Action<BacktestingDataRequestStatusChangedEventArgs>` — 

Available since cAlgo.API 5.3.

### Examples

C#:

```csharp
private void OnDataRequested(BacktestingDataRequest request)
{
    request.StatusChanged += OnRequestStatusChanged;
}

private void OnRequestStatusChanged(BacktestingDataRequestStatusChangedEventArgs args)
{
    Print("Request for {0} status changed to {1}", args.DataRequest.PriceDataSourceId.Symbol.Name, args.DataRequest.Status);
}
```

Python:

```python
def on_data_requested(self, request):
    request.StatusChanged += self.on_request_status_changed

def on_request_status_changed(self, args):
    api.Print(f"Request for {args.DataRequest.PriceDataSourceId.Symbol.Name} status changed to {args.DataRequest.Status}")
```