use AJAX achieve tree, a very convenient and practical. Please use.

HttpForAjax
...........\AssemblyInfo.cs
...........\bin
...........\...\Ajax.dll
...........\...\dtable.dll
...........\...\en-US
...........\...\.....\Lion.Web.Calendar.resources.dll
...........\...\HttpForAjax.dll
...........\...\HttpForAjax.pdb
...........\...\Lion.Web.Calendar.DLL
...........\...\ttyu.DB7.DataAccess.dll
...........\...\ttyu.DB7.DataAccess.pdb
...........\...\Ttyu.Web.dll
...........\...\Ttyu.Web.pdb
...........\...\zh-CN
...........\...\.....\Lion.Web.Calendar.resources.dll
...........\Class
...........\.....\AjaxData.cs
...........\.....\PageEdit.cs
...........\.....\ttyuPKData.cs
...........\.....\WebPublic.cs
...........\.....\WinPublic.cs
...........\css
...........\...\dhtmlXTree.css
...........\...\myStyle.css
...........\Global.asax
...........\Global.asax.cs
...........\Global.asax.resx
...........\HttpForAjax.csproj
...........\HttpForAjax.csproj.webinfo
...........\HttPForAjax.sln
...........\images

...........\......\dot.gif
...........\......\Dot01.gif
...........\......\dot02.GIF
...........\......\Dot03.gif
...........\......\find.gif
...........\......\home.gif
...........\......\icon_delete.gif
...........\......\icon_delete_over.gif
...........\......\icon_edit.gif
...........\......\icon_new.gif
...........\......\icon_new_over.gif
...........\......\md2.gif
...........\......\redfangkuai.gif
...........\......\saveChart.gif
...........\......\sdot.gif
...........\imgs
...........\....\blank.gif
...........\....\folderClosed.gif
...........\....\folderOpen.gif
...........\....\iconClient.gif
...........\....\leaf.gif
...........\....\line1.gif
...........\....\line2.gif
...........\....\line3.gif
...........\....\line4.gif
...........\....\minus.gif
...........\....\minus2.gif
...........\....\minus3.gif
...........\....\minus4.gif
...........\....\minus5.gif
...........\....\minus_ar.gif
...........\....\plus.gif
...........\....\plus2.gif
...........\....\plus3.gif
...........\....\plus4.gif
...........\....\plus5.gif
...........\....\plus_ar.gif
...........\InfoClass.htm
...........\InfoClass_edit.aspx
...........\InfoClass_edit.aspx.cs
...........\InfoClass_edit.aspx.resx
...........\InfoGrade.htm
...........\InfoGrade_edit.aspx
...........\InfoGrade_edit.aspx.cs
...........\InfoGrade_edit.aspx.resx
...........\js
...........\..\dhtmlXCommon.js
...........\..\dhtmlXTree.js
...........\..\dhtmlXTreeFake.js
...........\..\Xml.js
...........\lionsky_client
...........\..............\Lion.Web.WebCalendar.2
...........\..............\......................\web.config
...........\Web.config
...........\WebForm1.aspx
...........\WebForm1.aspx.cs
...........\WebForm1.aspx.resx
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