ASP.NET

i have site map like

<?xml version="1.0" encoding="utf-8" ?>

<siteMapNode url="~/DE/index.aspx" title="DE Home"  description="DE Home">
<siteMapNode url="~/DE/Parts.aspx" title="Part"  description="DE Part" />
<siteMapNode url="~/DE/SubParts.aspx" title="Subpart"  description="DE Subpart" />
</siteMapNode>

<siteMapNode url="~/US/index.aspx" title="US Home"  description="US Home">
<siteMapNode url="~/US/Parts.aspx" title="Part"  description="US Part" />
<siteMapNode url="~/US/SubParts.aspx" title="Subpart"  description="US Subpart" />
</siteMapNode>

<siteMapNode url="~/UK/index.aspx" title="UK Home"  description="UK Home">
<siteMapNode url="~/UK/Parts.aspx" title="Part"  description="UK Part" />
 <siteMapNode url="~/UK/SubParts.aspx" title="Subpart"  description="UK Subpart" />
</siteMapNode>

</siteMapNode>
</siteMap>

everything is working fine but last link in my breadcrum is showing as link rather it should show as label or span. how to get control over the generation of site navigation link and detect the link is last link and if the link is last link then span will be render other wise anchor tag will be render for site navigation in the page. how to achieve it. thanks

private static CultureInfo GetLoggedInUserCulture()
{
    string folderName = string.Empty;
    string sID = GetWindowsLoggedInUserSID();
    object locale = Registry.Users.OpenSubKey(sID + @"\Control Panel\International").GetValue("Locale");
    int lCID = int.Parse(locale.ToString(), NumberStyles.HexNumber);
    CultureInfo ci = new CultureInfo(lCID);
    return ci;
}
private static string GetWindowsLoggedInUserSID()
{
    string userName = null;
    string sID = null;
    try
    {
        ManagementScope oMs = new ManagementScope();
        ObjectQuery oQuery = new ObjectQuery("Select UserName from Win32_ComputerSystem");
        ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs, oQuery);
        ManagementObjectCollection oReturnCollection = oSearcher.Get();
        ManagementClass mc = new ManagementClass(oMs, new ManagementPath("ServerBinding"), null);
        foreach (ManagementObject oReturn in oReturnCollection)
        {
              userName = oReturn["UserName"].ToString().ToLower();
        }

            userName = userName.Substring(userName.LastIndexOf(@"\") + 1);
            oQuery = new ObjectQuery("Select SID, Name from Win32_Account where Name = '" + userName + "'");
            oSearcher = new ManagementObjectSearcher(oMs, oQuery);
            oReturnCollection = oSearcher.Get();

            foreach (ManagementObject oReturn in oReturnCollection)
            {
                if (oReturn["SID"] != null)
                {
                    sID = oReturn["SID"].ToString();
                }
            }
    }
    catch (Exception)
    {
        throw;
    }
    return sID;
}