Open the TreeViewDynamic. Aspx page, switch to Design view, and then in the Toolbox, from the Standard group, drag a Label control onto the page and name it labelStatus.

• 打开TreeViewDynamic.；aspx页；切换到“设计”视图；然后在Toolbox中；从“标准”组中将Label控件拖到页上；并将该控件命名为“labelStatus”。