---
id: "E:cAlgo.API.AspSymbolTab.SymbolChanged"
kind: "event"
type: "T:cAlgo.API.AspSymbolTab"
url: "https://help.ctrader.com/ctrader-algo/references/Plugin/Asp/AspSymbolTab/SymbolChanged/"
---

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

# AspSymbolTab.SymbolChanged

Member of [AspSymbolTab](https://help.ctrader.com/ctrader-algo/references/Plugin/Asp/AspSymbolTab/index.md).

## SymbolChanged

Occurs when active symbol panel selected symbol changes.

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<AspSymbolChangedEventArgs> SymbolChanged;
```

Python:

```python
aspSymbolTab.SymbolChanged += handler  # handler(obj: AspSymbolChangedEventArgs)
```

### Returns

`Action<AspSymbolChangedEventArgs>` — 

### Examples

C#:

```csharp
protected override void OnStart()
{
    Asp.SymbolTab.SymbolChanged += OnAspSymbolChanged;
}

private void OnAspSymbolChanged(AspSymbolChangedEventArgs args)
{
    Print("Active symbol panel symbol changed from {0} to {1}", args.OldSymbol.Name, args.NewSymbol.Name);
}
```

Python:

```python
def on_start(self):
    api.Asp.SymbolTab.SymbolChanged += self.on_asp_symbol_changed

def on_asp_symbol_changed(self, args):
    api.Print(f"Active symbol panel symbol changed from {args.OldSymbol.Name} to {args.NewSymbol.Name}")
```