Hello i have following data coming through sql query

Categoryname level

Jewellery 1

earings 2

Bindi 2

Bangles 3

Payal 4

Ring 4

Computer 1

Laptop 2

Hard disk 3

it can on any level, i am binding to listivew

<asp:ListView ID="ListView1" runat="server">
    <ItemTemplate>
        <asp:Label ID="Label1" runat="server" Text='<%#Eval("categoryname") %>' ></asp:Label>
        <asp:Label ID="Label1" runat="server" Text='<%#Eval("level") %>' Visible="false"></asp:Label>
    </ItemTemplate>
</asp:ListView>

i want it to diplay based on its level

Jewellery 1
    earnings    2
    Bindi       2
        Bangles     3
            Payal       4
            Ring        4
 
 
Computer    1
    Laoptop     2
        Hard disk   3