---
title: "OperationNotCompletedException Class"
canonical: https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_OperationNotCompletedException.htm
product: "Graphics Mill 5.5 for .NET"
---

This documentation is for the old version. [Go to the latest Graphics Mill docs](https://www.graphicsmill.com/docs/gm/)

# OperationNotCompletedException Class
 
This exception is thrown when you try to run an operation which is already running, or influence it in the way which is not allowed until operation is not completed.
 
**Namespace:** [Aurigma.GraphicsMill](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill.htm.md)
 **Assembly:** Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)
 
## Syntax
  
```
<SerializableAttribute> _
Public Class OperationNotCompletedException _Inherits Exception
```
 
```csharp
[SerializableAttribute]
public class OperationNotCompletedException : Exception
```
 
## Remarks
 For example, if you try to change [SynchronizationMode](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_SyncHandler_SynchronizationMode.htm.md) property when operation is running, you will get this exception.
 
## Inheritance Hierarchy
  
- [System.Object](http://msdn2.microsoft.com/en-us/e5kfa45b)
    - [System.Exception](http://msdn2.microsoft.com/en-us/c18k6c59)
        - [System.ApplicationException](http://msdn2.microsoft.com/en-us/ww58ded5)
            - [Aurigma.GraphicsMill.Exception](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Exception.htm.md)
                - Aurigma.GraphicsMill.OperationNotCompletedException
   
## See Also

### Reference

- [OperationNotCompletedException Members](https://www.graphicsmill.com/docs/gm5/AllMembers_T_Aurigma_GraphicsMill_OperationNotCompletedException.htm.md)
- [Aurigma.GraphicsMill Namespace](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill.htm.md)