---
title: "ICallBackDataHandler Interface"
canonical: https://www.graphicsmill.com/docs/gmwc/T_Aurigma_GraphicsMill_AjaxControls_ICallBackDataHandler.htm
archived: true
applies_to:
  - product: "Graphics Mill Web Controls"
---

**You’re viewing documentation for an outdated product.** Graphics Mill Web Controls is no longer part of Graphics Mill. For current design editing and rendering tools, see [Design Atoms .NET](https://customerscanvas.com/docs/on-premises/design-atoms-cs/), [Design Atoms JS](https://customerscanvas.com/docs/on-premises/design-atoms-js/), and [Design Editor](https://customerscanvas.com/docs/on-premises/design-editor/).

# ICallBackDataHandler Interface

**Applies to:** Graphics Mill Web Controls · **Archived documentation**
 
This interface is implemented by all the controls which can change their states during execution of the callback initiated by another control.
 
**Namespace:** [Aurigma.GraphicsMill.AjaxControls](https://www.graphicsmill.com/docs/gmwc/N_Aurigma_GraphicsMill_AjaxControls.htm.md)
 **Assembly:** Aurigma.GraphicsMill.AjaxControls (in Aurigma.GraphicsMill.AjaxControls.dll)
 
## Syntax
  
```csharp
public interface ICallBackDataHandler
```
 
## Remarks
 This interface has one method which returns the string used to update the client-side object corresponded to the server-side control.
   
## See Also

### Reference

- [ICallBackDataHandler Members](https://www.graphicsmill.com/docs/gmwc/AllMembers_T_Aurigma_GraphicsMill_AjaxControls_ICallBackDataHandler.htm.md)
- [Aurigma.GraphicsMill.AjaxControls Namespace](https://www.graphicsmill.com/docs/gmwc/N_Aurigma_GraphicsMill_AjaxControls.htm.md)