在code-behind代码中写入： //设置为默认的消息窗口 popupWin.ActionType=PopupWidow.Web.PopupAction.MessageWindow; //设置窗口的标题，消息文字 popupWin.Title="This is popup"; popupWin.Message="＜i＞Message＜/i＞ displayed in popup& quot;; popupWin.Text="Text to show in new window..";