csharp write the tree structure, nodes can find, insert, delete and other operations

TreeListView\Demo\App_Code\Class1.cs
............\....\........\DataSet1.xsd
............\....\........\DataSet1.xss
............\....\........\DialogButtonTemplate.cs
............\....\........\DialogImageButton.cs
............\....\........\MasterPageBase.cs
............\....\........\MyEntity.cs
............\....\........\PageBase.cs
............\....\........\SQLHelper.cs
............\....\........\vssver2.scc
............\....\....Data\data.xml
............\....\aspnet_client\system_web\2_0_50727\CrystalReportWebFormViewer3\CSs\default.css
............\....\.............\..........\.........\...........................\...\vssver2.scc
............\....\.............\..........\.........\...........................\html\calendar.html
............\....\.............\..........\.........\...........................\....\calendarbottom.html
............\....\.............\..........\.........\...........................\....\calendartop.html
............\....\.............\..........\.........\...........................\....\crystalexportdialog.htm
............\....\.............\..........\.........\...........................\....\crystalprinthost.html
............\....\.............\..........\.........\...........................\....\vssver2.scc
............\....\.............\..........\.........\...........................\Images\ToolBar\calendar.gif
............\....\.............\..........\.........\...........................\......\.......\crlogo.gif
............\....\.............\..........\.........\...........................\......\.......\export.gif
............\....\.............\..........\.........\...........................\......\.......\exportd.gif
............\....\.............\..........\.........\...........................\......\.......\export_over.gif
............\....\.............\..........\.........\...........................\......\.......\First.gif
............\....\.............\..........\.........\...........................\......\.......\Firstd.gif
............\....\.............\..........\.........\...........................\......\.......\first_over.gif
............\....\.............\..........\.........\...........................\......\.......\gotopage.gif
............\....\.............\..........\.........\...........................\......\.......\gotopaged.gif
............\....\.............\..........\.........\...........................\......\.......\gotopage_over.gif
............\....\.............\..........\.........\...........................\......\.......\grouptree.gif
............\....\.............\..........\.........\...........................\......\.......\grouptreed.gif
............\....\.............\..........\.........\...........................\......\.......\grouptreepressed.gif
............\....\.............\..........\.........\...........................\......\.......\grouptree_over.gif
............\....\.............\..........\.........\...........................\......\.......\Last.gif
............\....\.............\..........\.........\...........................\......\.......\Lastd.gif
............\....\.............\..........\.........\...........................\......\.......\last_over.gif
............\....\.............\..........\.........\...........................\......\.......\Next.gif
............\....\.............\..........\.........\...........................\......\.......\Nextd.gif
............\....\.............\..........\.........\...........................\......\.......\next_over.gif
............\....\.............\..........\.........\...........................\......\.......\Prev.gif
............\....\.............\..........\.........\...........................\......\.......\Prevd.gif
............\....\.............\..........\.........\...........................\......\.......\prev_over.gif
............\....\.............\..........\.........\...........................\......\.......\print.gif
............\....\.............\..........\.........\...........................\......\.......\print

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