rootEntry = new DirectoryEntry("WinNT:");
...
foreach(DirectoryEntry child in rootEntry.Children)
{			
	DomainEntries.Add(new _DomainEntry(child.Name,child));
}

string WmiNamespace = string.Format(@"\\{0}\root\CIMV2", IP);
...
using (ManagementObjectSearcher searcher =
new ManagementObjectSearcher(WmiNamespace, 
string.Format("SELECT * FROM Win32_Group WHERE LocalAccount = True and Name = '{0}'",LocalGroupName))
                            {
                                ManagementObjectCollection moc = searcher.Get();
                                haveLg =  (moc.Count == 1)
                                
                            }