<asp:TreeView ID = "tvwOne" runat = "server" Height="100%" Width="100%" ImageSet = "News" >
<Nodes>
<asp:TreeNode Text="数据库" Value="数据库" SelectAction="expand">
<asp:TreeNode Text="oracle" Value="oracle" SelectAction="expand">
<asp:TreeNode Text="第一个;" Value="第一个" NavigateUrl="/One.aspx"></asp:TreeNode>
<asp:TreeNode Text="第二个;" Value="第二个" NavigateUrl="/Two.aspx"></asp:TreeNode>
<asp:TreeNode Text="第三个;" Value="第三个" NavigateUrl="/Three.aspx"></asp:TreeNode>
</asp:TreeNode>
</asp:TreeNode>
</Nodes>
</asp:TreeView>
treeNode.SelectAction = TreeNodeSelectAction.Expand;
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