Public Function GetCachedSiteDataQuery ( _
    webNode As PortalWebSiteMapNode, _
    query As SPSiteDataQuery, _
    contextWeb As SPWeb _
) As DataTable

Dim instance As PortalSiteMapProvider
Dim webNode As PortalWebSiteMapNode
Dim query As SPSiteDataQuery
Dim contextWeb As SPWeb
Dim returnValue As DataTable

returnValue = instance.GetCachedSiteDataQuery(webNode, query, contextWeb)

public DataTable GetCachedSiteDataQuery (
    PortalWebSiteMapNode webNode,
    SPSiteDataQuery query,
    SPWeb contextWeb
)

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Web;

using Microsoft.SharePoint;
using Microsoft.SharePoint.Navigation;

using Microsoft.SharePoint.Publishing;
using Microsoft.SharePoint.Publishing.Navigation;


namespace Microsoft.SDK.SharePointServer.Samples
{
    class GetCachedSiteDataQuerySample
    {
        // Runs a given site data query against the cache and returns the results.
        // Note: You must call this method from within an HttpContext object (for example, HttpContext.Current 
        // must return a valid HttpContext).

        public DataTable GetCachedSiteDataQuery(string webUrl, SPSiteDataQuery siteDataQuery)
        {
            PortalSiteMapProvider portalProvider = PortalSiteMapProvider.CurrentNavSiteMapProviderNoEncode;
            PortalWebSiteMapNode webNode = portalProvider.FindSiteMapNode(webUrl) as PortalWebSiteMapNode;
            if (webNode != null)
            {
                return portalProvider.GetCachedSiteDataQuery(
                    webNode, siteDataQuery, SPContext.Current.Web);
            }
            return null;
        }

    }

}