Using XPathDocument in place of DataSet

//Create object of XPathDocument
XPathDocument docNav = new XPathDocument(strPath);
//Create the XPathNavigator
XPathNavigator nav = docNav.CreateNavigator();
//Set the pointer at ShoppingRule node
expr = nav.Compile("/Rule/ShoppingRule");
//Get all the ShoppingRule node from the XML.
XPathNodeIterator parentIterator = nav.Select(expr);
//Treverse on all the shoppingRules node
while(parentIterator.MoveNext()
{
if (parentIterator.Current.HasChildren)
{
//Move to the first child node of the ShoppingRules
parentIterator.Current.MoveToChild(XPathNodeType.Element);
strTransactionCode = parentIterator.Current.Value;
}
//Get all the childs of ShoppingRules node
XPathNodeIterator children = childNode.SelectChildren(XPathNodeType.Element);
//Traverse on all the child node of the ShoppingRules nodes.
while (children.MoveNext())
{
}
}