bool ValidateOperation(string message)
        {
            var password = "";

            if ((password = PasswordBox.ShowDialog(message)) == "")
            {
                return(false);
            }
            if (password != "123456")
            {
                MessageBox.Show("密码错误", "密码", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return(false);
            }
            return(true);
        }
        private void Button2_Click(object sender, EventArgs e)
        {
            PasswordBox box = new PasswordBox();

            box.Text    = "密码";
            box.Content = "请输入6位密码:";
            box.ButtonDefaultCancelText = "取消";
            box.ButtonCleanText         = "清除";
            box.ButtonOKText            = "确认";
            box.CheckFormat             = (psw) =>
            {
                if (psw.Length >= 6)
                {
                    return(true);
                }
                return(false);
            };
            box.ShowDialog();
        }