ASP.NET Tutorial/ADO.net Database/SqlHierarchicalDataSource

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Building a SQL Hierarchical Data Source Control

<%@ Page Language="C#" %>
<%@ Register TagPrefix="custom" Namespace="MyNamespace" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">
    protected void Menu1_MenuItemClick(object sender, MenuEventArgs e)
    {
        lblSelected.Text = Menu1.SelectedValue;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show Menu</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:Menu
        id="Menu1"
        DataSourceId="srcCategories"
        OnMenuItemClick="Menu1_MenuItemClick"
        Orientation="Horizontal"
        DynamicMenuStyle-CssClass="menu"
        Runat="server">
        <DataBindings>
            <asp:MenuItemBinding TextField="Name" ValueField="Name" />
        </DataBindings>
    </asp:Menu>
    <custom:SqlHierarchicalDataSource
        id="srcCategories"
        ConnectionString="<%$ ConnectionStrings:Categories %>"
        DataKeyName="CategoryId"
        DataParentKeyName="ParentId"
        SelectCommand="SELECT CategoryId, ParentId, Name FROM Categories"
        Runat="server" />
    <hr />
    <asp:Label
        id="lblSelected"
        Runat="server" />
    </div>
    </form>
</body>
</html>


Use the SqlHierarchicalDataSource control when working with the TreeView control

<%@ Page Language="C#" %>
<%@ Register TagPrefix="custom" Namespace="MyNamespace" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">
    protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
    {
        lblSelected.Text = TreeView1.SelectedValue;
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Show TreeView</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <asp:TreeView
        id="TreeView1"
        DataSourceID="srcDiscuss"
        OnSelectedNodeChanged="TreeView1_SelectedNodeChanged"
        ImageSet="News"
        Runat="server">
        <DataBindings>
            <asp:TreeNodeBinding
                TextField="Subject"
                ValueField="MessageId" />
        </DataBindings>
    </asp:TreeView>
    <custom:SqlHierarchicalDataSource
        id="srcDiscuss"
        ConnectionString="<%$ ConnectionStrings:Discuss %>"
        DataKeyName="MessageId"
        DataParentKeyName="ParentId"
        SelectCommand="SELECT MessageId,ParentId,Subject FROM Discuss"
        Runat="server" />
    <hr />
    You selected message number:
    <asp:Label
        id="lblSelected"
        Runat="server" />
    </div>
    </form>
</body>
</html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/ADO.net_Database/SqlHierarchicalDataSource&oldid=2686»