多项选择题
A.this.hdr1.InnerHtml = "Text"；
B.（hdr1.Parent as HtmlGenericControl）.InnerText = "Text"；
C.HtmlGenericControl h1 = this.FindControl（"hdr1"） as HtmlGenericControl；h1.InnerText = "Text"；
D.HtmlGenericControl h1 = Parent.FindControl（"hdr1"） as HtmlGenericControl；h1.InnerText = "Text"；
单项选择题 You are implementing an ASP.NET page that includes the following drop-down list. You need to dynamically add values to the end of the drop-down list. What should you do? （）
多项选择题 You create a custom server control named Task that contains the following code segment. You need to ensure that adding a Task control from the Toolbox creates markup in the following format. Which two actions should you perform？（）
多项选择题 YouusethefollowingdeclarationtoaddaWebusercontrolnamedTestUserControl.ascxtoanASP.NETpagenamedTestPage.aspx.Youaddthefollowingcodetothecode-behindfileofTestPage.aspx.privatevoidTestMethod（）{...}Youdefinethefollowingdelegate.publicdelegatevoidMyEventHandler（）；YouneedtoaddaneventoftypeMyEventHandlernamedMyEventtoTestUserControl.ascxandattachthepage’sTestMethodmethodtotheevent.Whichtwoactionsshouldyouperform？（）