---
id: "T:cAlgo.API.CustomSymbolBarsUnloadedEventArgs"
kind: "class"
namespace: "cAlgo.API"
url: "https://help.ctrader.com/ctrader-algo/references/EventArgs/CustomSymbolBarsUnloadedEventArgs/"
---

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

# CustomSymbolBarsUnloadedEventArgs (class)

Provides data for custom symbol BarsUnloaded event.

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.

## Definition

```csharp
public class CustomSymbolBarsUnloadedEventArgs
```

Available since cAlgo.API 5.3.

## Examples

C#:

```csharp
protected override void OnStart()
{
    var customSymbol = CustomSymbols.Add("EURUSD.custom", Symbols.GetSymbol("EURUSD"));
    customSymbol.BarsUnloaded += OnCustomSymbolBarsUnloaded;
}

private void OnCustomSymbolBarsUnloaded(CustomSymbolBarsUnloadedEventArgs args)
{
    Print("{0} {1} bars were unloaded", args.CustomSymbol.Name, args.CustomBars.TimeFrame);
}
```

Python:

```python
def on_start(self):
    customSymbol = api.CustomSymbols.Add("EURUSD.custom", api.Symbols.GetSymbol("EURUSD"))
    customSymbol.BarsUnloaded += self.on_custom_symbol_bars_unloaded

def on_custom_symbol_bars_unloaded(self, args):
    api.Print(f"{args.CustomSymbol.Name} {args.CustomBars.TimeFrame} bars were unloaded")
```

## Properties

- `public CustomBars CustomBars {get;}` — Gets custom bars that was unloaded. [details](https://help.ctrader.com/ctrader-algo/references/EventArgs/CustomSymbolBarsUnloadedEventArgs/CustomBars/index.md)
- `public CustomSymbol CustomSymbol {get;}` — Gets custom symbol. [details](https://help.ctrader.com/ctrader-algo/references/EventArgs/CustomSymbolBarsUnloadedEventArgs/CustomSymbol/index.md)