private void Button1_Click_1(object sender, EventArgs e)
        {
            Test.database SQL = new Test.database();
            if (SQL.verifyPassWord(ID.Text.ToString(), PS.Text.ToString()))
            {
                if (SQL.verifyUserRole(ID.Text.ToString()))
                {
                    Main mainView = new Main();


                    this.Hide();
                    mainView.ShowDialog();
                    this.ID.Text = string.Empty;
                    this.PS.Text = string.Empty;

                    this.Show();
                }
                else
                {
                    MessageBox.Show("没有登陆权限");
                }
            }
            else
            {
                MessageBox.Show("账户或密码错误");
            }
        }