关于域用户删除的的问题？

                
                //创建新的用户 默认Users下
                string newUsername = this.TextBox1.Text.Trim();                try
                {
                    DirectoryEntry ent = new DirectoryEntry();
                    DirectoryEntry ou = ent.Children.Find("CN=Users");
                    DirectoryEntry usr = ou.Children.Add("CN=" + newUsername, "user");
                    usr.Properties["samAccountName"].Value = newUsername;
                    //usr.Invoke("SetPassword", new Object[] { passWord });
                    usr.CommitChanges();
                    usr.Invoke("SetPassword", new Object[] { passWord });
                    int val = (int)usr.Properties["userAccountControl"].Value;
                    usr.Properties["userAccountControl"].Value = val &
                        ~ADS_UF_ACCOUNTDISABLE;
                    usr.CommitChanges();
                }
                catch (System.Exception ex)
                {
                    //异常的场合
                    System.Windows.Forms.MessageBox.Show(ex.Message);
                    return;
                } //读取指定组
 public DirectoryEntry GetDirectoryEntryOfGroup(string groupName)
        {
            DirectoryEntry de = new DirectoryEntry();
            DirectorySearcher deSearch = new DirectorySearcher(de);
            deSearch.Filter = "(&(objectClass=group)(cn=" + groupName + "))";
            deSearch.SearchScope = SearchScope.Subtree;            try
            {
                SearchResult result = deSearch.FindOne();
                de = new DirectoryEntry(result.Path);
                return de;
            }
            catch
            {
                return null;
            }
        }//读取指定用户
public DirectoryEntry GetDirectoryEntry(string commonName)
        {
            DirectoryEntry de = GetDirectoryObject();
            DirectorySearcher deSearch = new DirectorySearcher(de);
            deSearch.Filter = "(&(&(objectCategory=person)(objectClass=user))(cn=" + commonName + "))";
            deSearch.SearchScope = SearchScope.Subtree;            try
            {
                SearchResult result = deSearch.FindOne();
                de = new DirectoryEntry(result.Path);
                return de;
            }
            catch
            {
                return null;
            }
        }//从指定组中删除指定用户
DirectoryEntry group = this.GetDirectoryEntryOfGroup("Users");
                DirectoryEntry entry = this.GetDirectoryEntry(this.TextBox1.Text.Trim());
                group.Properties["member"].Remove(entry.Properties["distinguishedName"].Value);
                group.CommitChanges();//执行到这时报“该服务器不愿意处理该请求。 (异常来自 HRESULT:0x80072035)”哪位大侠知道是怎么回事啊，谢谢！
我现在的登录用户已经是Administrator管理员用户了