单项选择题 YouaredevelopingaAsp.netwebapplicationthtincludesapanelcontrolthathasIDcontentsection.YouneedtoaddatextBoxcontroltothepanelcontrol.（）

单项选择题 Youareperfomingsecuritytestingonanexistingasp.netwebpage.Younoticethatyouareabletoissueunauthorisedpostbackrequeststothepage.Youneedtopreventunauthorisedpostbackrequests.whichpagedirectiveyouuse？（）

单项选择题 The page will be posted to the server after one or more image files are selected for upload.You need to ensure that all unuploaded files are saved to the server within one call to a single event handler.  What should you do？ （）