InfoPath Dev

Hi,I have a problem.When i use vs2003 to develop Infopath with secondary data source.I found it didn't have setPropety function.But in javascript has this function.
example:XDocument.GetDOM("Customers (USA)").setProperty("SelectionNamespaces",
'xmlns:q="http://schemas.microsoft.com/office/infopath/2003/ado/queryFields" ' +
'xmlns:d="http://schemas.microsoft.com/office/infopath/2003/ado/dataFields" ' +
'xmlns:dfs="http://schemas.microsoft.com/office/infopath/2003/dataFormSolution"');
Please everyone can tell me how to write in vs2003?thanks.

Hello liuqian,
You need to cast the secondary data source dom as an IXMLDOMDocument2 before you setProperty on it. Your code would look something like this in VS2003
domCustomersUSA = (IXMLDOMDocument2)thisXDocument.GetDOM("Customers (USA)");
domCustomersUSA.setProperty("SelectionNamespaces",
"xmlns:q=\"http://schemas.microsoft.com/office/infopath/2003/ado/queryFields\" xmlns:d=\"http://schemas.microsoft.com/office/infopath/2003/ado/dataFields\" xmlns:dfs=\"http://schemas.microsoft.com/office/infopath/2003/dataFormSolution\"");

Shanthi