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# OnDeletePages Method of the IDocumentViewerEvents Interface

> OnDeletePages method of the IDocumentViewerEvents Interface in ABBYY FineReader Engine Visual Components on Windows — This method is implemented on the client-side.

This method is implemented on the client-side. It is called by ABBYY FineReader Engine before deleting a page from the document in [Document Viewer](/fine-reader/engine/visual-components-reference/documentviewer). The process can be invoked in one of the following ways:

* Delete Page from Document item in the context menu is selected
* [MI\_DeletePage](/fine-reader/engine/visual-components-reference/documentviewer/document-viewer-commands#mi_deletepage) command is called using the [DoCommand](/fine-reader/engine/visual-components-reference/supplementary-objects/commands/docommand-method) method of the IDocumentViewer::Commands

It informs the client that a page is going to be deleted. With the help of this method it is possible to cancel the operation.

## Syntax

### C++

```cpp theme={null}
HRESULT OnDeletePages( VARIANT_BOOL* Cancel );
```

### C\#

```csharp theme={null}
void OnDeletePages( out bool Cancel );
```

### Visual Basic .NET

```vb theme={null}
Sub OnDeletePages(ByRef Cancel As Boolean)
```

## Parameters

Cancel

\[out] You may set this variable to TRUE to indicate that the process should be terminated. In this case, a page will not be deleted.

## Return values

\[C++ only] If this method returns a value other than S\_OK, it indicates that an error occurred on the client-side, and in this case the value of the Cancel parameter is not taken into account.

## Remarks

The client implementation of this method must assure that all exceptions thrown inside the method are caught and handled and no exceptions are propagated outside the method. Propagation of an exception outside the method may lead to unpredictable results (such as program termination).

## See also

[IDocumentViewerEvents](/fine-reader/engine/visual-components-reference/idocumentviewerevents)