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            DirectoryEntry objComputer = new DirectoryEntry(@"LDAP://xxx.xxx.xxx.xxx", "xxxxx", "xxxxx", AuthenticationTypes.Secure);
            DirectorySearcher search = new DirectorySearcher(objComputer,
                                                             "(&(objectCategory=computer)(name=mibaz-bma))");					

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            DirectoryEntry objComputer = new DirectoryEntry(@"LDAP://xxx.xxx.xxx.xxx", "xxxxxx", "xxxxx", AuthenticationTypes.Secure);
            DirectorySearcher search = new DirectorySearcher(objComputer,
                                                             "(&(objectCategory=computer)(name=xxxxxxxxx))");

            SearchResult result = search.FindOne();
            DirectoryEntry delComputer = new DirectoryEntry(result.Path, "xxxxxx", "xxxxx", AuthenticationTypes.Secure);
            delComputer.DeleteTree();
            delComputer.CommitChanges();
            delComputer.Close();
            Console.ReadLine();					

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            ManagementObject manage = new ManagementObject(string.Format("Win32_ComputerSystem.Name='{0}'", Environment.MachineName));
            object[] join = { "Workgroup", null, null, 1 };
            UInt32 retvalue;
            retvalue = (UInt32) manage.InvokeMethod("JoinDomainOrWorkgroup", join);