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# QueryAdapter Property (DataObject Object)

A read-only property that returns a reference to the data adapter object that is used for a secondary data source.

expression.QueryAdapter

expression Required. An expression that returns a reference to the DataObject 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

After you have set a reference to the data adapter object that the QueryAdapter property returns, you can use the properties and methods that the particular data adapter object contains.

Microsoft Office InfoPath 2003 supports three types of data adapters:

1. ActiveX Data Objects Represented by the ADOAdapter object.
2. Web services Represented by the WebServiceAdapter object.
3. XML file Represented by the XMLFileAdapter object.

## Example

In the following example, the QueryAdapter property of the DataObject object is used to return a reference to the data adapter that is associated with the DataObject object, which, in this case, is an ADOAdapter data adapter object. The code then uses the Command property of the ADOAdapter object to display the SQL command text in a message box:

    var objDataAdapter;

    objDataAdapter = XDocument.DataObjects("CityList").QueryAdapter;
    XDocument.UI.Alert("SQL command text: " + objDataAdapter.Command);

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