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# OldValue Property

A read-only property that returns a string value indicating the original value of an XML Document Object Model (DOM) node that is being updated or deleted during a data validation event.

expression.OldValue

expression Required. Returns a reference to the DataDOMEvent object.

## Security Level

2: Can be accessed only by forms running in the same domain as the currently open form, or by forms that have been granted cross-domain permissions.

## Remarks

The OldValue property contains the original value of the XML DOM node that will be replaced with a new value or deleted. To get the new value of the XML DOM node, use the NewValue property of the DataDOMEvent object.

## Example

In the following example, the OldValue property of the DataDOMEvent object is used to display the original value of an XML DOM node, along with its new value:

    XDocument.UI.Alert("Original value: " + eventObj.OldValue +
       "\nNew value: " + eventObj.NewValue);

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