/// <summary>
        /// 更改Windows帐户密码
        /// </summary>
        /// <param name="username"></param>
        /// <param name="oldPwd"></param>
        /// <param name="newPwd"></param>
        public static void ChangeWinUserPasswd(string username, string oldPwd, string newPwd)
        {
            try
            {
                DirectoryEntry localMachine = new DirectoryEntry("WinNT://" + Environment.MachineName + ",computer");
                DirectoryEntry user = localMachine.Children.Find(username, "user");
                object[] password = new object[] { oldPwd, newPwd };
                object ret = user.Invoke("ChangePassword", password);
                user.CommitChanges();
                localMachine.Close();
                user.Close();
            }
            catch (Exception)
            {
               
            }
        }


//csharp/5475