You are developing a page named Process.aspx in a shopping cart Web application that will be integrated into Certkiller .com's existing e-Commerce Web site. The Process.aspx page allows customers to pay for purchases using their credit cards. The Process.aspx page contains a Button control that confirms the customer's payment and calls an external Web service that charges the customer's credit card. You must implement confirmation and prevent postback unless the customer confirms payment. What should you do?（）
你開發(fā)一個(gè)管理信用卡信息的Web控件。這個(gè)Web控件代碼顯示在下圖。 你在Web窗體上使用如下的代碼段注冊(cè)了此控件： TagPrefix="cc1"%> 現(xiàn)在，你需要在Web窗體上聲明這個(gè)控件，你應(yīng)該使用下面那個(gè)代碼段？（）
你已經(jīng)創(chuàng)建了一個(gè) XmlDocument 的一個(gè)實(shí)例 doc 并且裝載了如下的 XML 文檔:
現(xiàn)在，你需要改變 city 的值為 watertown。你應(yīng)該使用下面哪段代碼？（）
