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# OnDocumentChanged Method of the ITextValidatorEvents Interface

> OnDocumentChanged method of the ITextValidatorEvents 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, after the active document has been changed in [Text Validator](/fine-reader/engine/visual-components-reference/textvalidator). The process is invoked if the new document is specified via the [ITextValidator::FRDocument](/fine-reader/engine/visual-components-reference/textvalidator#frdocument) property.

The method delivers to the client a reference to the new document.

## Syntax

### C++

```csharp theme={null}
HRESULT OnDocumentChanged( IFRDocument* Document );
```

### C\#

```csharp theme={null}
void OnDocumentChanged( IFRDocument Document );
```

### Visual Basic .NET

```csharp theme={null}
Sub OnDocumentChanged(Document As IFRDocument)
```

## Parameters

Document

\[in] Refers to the [FRDocument](/fine-reader/engine/api-reference/document-related-objects/frdocument) object which contains the new active document.

## Return values

\[C++ only] If this method returns a value other than S\_OK, it indicates that an error occurred on the client-side.

## 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

[ITextValidatorEvents](/fine-reader/engine/visual-components-reference/itextvalidatorevents)