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Working with TreeNode Controls in a TreeView Control (VB net)

<%@ Page Language=VB Debug=true %> <%@ Import Namespace="Microsoft.Web.UI.WebControls" %> <%@ Register TagPrefix="IEControls"      Namespace="Microsoft.Web.UI.WebControls"      Assembly ="Microsoft.Web.UI.WebControls" %> <HTML> <HEAD> <TITLE>Working with TreeNode Controls in a TreeView Control</TITLE> </HEAD> <BODY LEFTMARGIN="40"> <form runat="server"> <IEControls:treeview     id="tvBasic"     autoselect="False"     showplus="True"     showlines="True"     expandlevel=2     runat="server">     <IEControls:treenode Text="Clothing">         <IEControls:treenode Text="A"/>         <IEControls:treenode Text="B"/>         <IEControls:treenode Text="C">             <IEControls:treenode Text="a"/>             <IEControls:treenode Text="b"/>             <IEControls:treenode Text="c"/>         </IEControls:treenode>     </IEControls:treenode>     <IEControls:treenode Text="Electronics">         <IEControls:treenode Text="A"/>         <IEControls:treenode Text="B"/>         <IEControls:treenode Text="C"/>         <IEControls:treenode Text="D"/>     </IEControls:treenode> </IEControls:treeview> </form> </BODY> </HTML>