How to get domain names from Windows Server 2003

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C#

Hi,

I have a system with Windows Server 2003. In this system, I have added an Active Directory with DNS Domain name as "mycompany.com". Now, I have another system(Win XP), in which I am developing a web application. My requirement is to get the domain name in the system with Windows Server 2003,(i.e., "mycompany.com") from the webapplication. I am using C# for web application. Both these systems are connected in LAN. But, XP system is logged in to a domain "ABC", where as Windows Server system is in "XYZ" domain. The IP address that I have used in the code below, is the IP of the Windows Server 2003 system which is in LAN with my XP system.

I am giving the code that I am using below:

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            ddDomains.Items.Clear();
            ddDomains.Items.Add(new ListItem("Select a Domain", "0"));
        }
    }
    private StringCollection GetDomainList()
    {
        StringCollection domainList = new StringCollection();
        try
        {
            DirectoryEntry adFolderObject = new DirectoryEntry("LDAP://192.168.10.100/");
            DirectorySearcher adSearcherObject = new DirectorySearcher(adFolderObject);
            adSearcherObject.SearchScope = SearchScope.Subtree;
            adSearcherObject.Filter = "objectCategory=Domain";
            foreach (SearchResult adObject in adSearcherObject.FindAll())
            {
                domainList.Add(adObject.ToString());
            }
        }
        catch (Exception ex)
        {
            Trace.Write(ex.Message);
        }
        return domainList;
    }
    protected void btnGetDomains_Click(object sender, EventArgs e)
    {
        StringCollection adDomains = this.GetDomainList();
        foreach (string strDomain in adDomains)
        {
            ddDomains.Items.Add(strDomain);
        }
    }

when I execute this, I ma getting an error "Unknown error (0x80005000)" at the line "foreach (SearchResult adObject in adSearcherObject.FindAll())". ( i.e., while executing "adSearcherObject.FindAll()").

Please help me why I am getting this error, and how to get the domain name to the dropdown list in my application. I am new to the LDAP and Active Directory stuff.

Thanks in advance.