# Router.NotFoundErrorHandler

Kind: Property  
Namespace: `Sisk.Core.Routing`  
Assembly: `Sisk.Core.dll`  
Source: https://docs.sisk-framework.org/api/Sisk.Core.Routing.Router.NotFoundErrorHandler.html

## NotFoundErrorHandler {#Sisk_Core_Routing_Router_NotFoundErrorHandler}

Gets or sets the Router "404 Not Found" handler.

```csharp
public RoutingErrorCallback? NotFoundErrorHandler { get; set; }
```

### Property Value

[RoutingErrorCallback](https://docs.sisk-framework.org/api/Sisk.Core.Routing.RoutingErrorCallback.md)?