Create LinkButtons with dynamic ID's - asp.net

Question

I've dabbled in the past with VB and ASP classic and am currently trying to write my first site in ASP.net and I'm very much learning as I go...but I've spent all of today trying to do this one and I've not got anywhere with the usual googling.
Hopefully it's apparent in my code that I am trying to dynamically add 2 LinkButtons with unique ID's below a LinkButton with a static ID. I want the IDs in the 2 unique LinkButtons to have the "companyname" dataitem value in it so that I can unhide them when the first "companylink" is clicked - I'm yet to write the sub "LoadCompany" to unhide the two LinkButton's but I'm pretty confident I already know how to do that.
<asp:Content ContentPlaceHolderID="leftsidebarcontent" runat="server">
<li id="leftsidebarhead" class="sidebaritems">/* MENU */</li><br />
<asp:Datalist id="customers" runat="server" RepeatLayout="Flow">
<ItemTemplate>
<li class="leftsidebaritem sidebaritems"><asp:LinkButton id="CompanyLink" runat="server" OnCommand="LoadCompany" Text='<%#Container.DataItem("companyname")%>'></asp:LinkButton></li>
<li class="leftsidebaritem sidebaritems"><asp:LinkButton id='<%#Container.DataItem("companyname")%> & "Reviews"' runat="server" Text="Reviews"></asp:LinkButton></li>
<li class="leftsidebaritem sidebaritems"><asp:LinkButton id='LinkButton1' runat="server" Text="Other"></asp:LinkButton></li>
<br />
</ItemTemplate>
</asp:Datalist>
If it helps - the first LinkButton is to populate a nav menu down the left of the page, below each one of these LinkButton's I want two further linkbuttons which will be hidden, until the original linkbutton is clicked, at which point they unhide - so creating a kind of nested navigation menu.

Answer 1

You can do like this in markup:
<asp:Content ID="Content1" ContentPlaceHolderID="leftsidebarcontent" runat="server">
<p id="leftsidebarhead" class="sidebaritems">/* MENU */</p>
<br />
<asp:DataList ID="customers" runat="server" RepeatLayout="Flow" OnItemCommand="customers_ItemCommand" >
<ItemTemplate>
<li class="leftsidebaritem sidebaritems">
<asp:LinkButton ID="CompanyLink" runat="server" CommandName="LoadCompany"
Text='<%#DataBinder.Eval(Container.DataItem, "companyname")%>'></asp:LinkButton></li>
<ul id="ulSubItems" runat="server" visible="false">
<li class="leftsidebaritem sidebaritems">
<asp:LinkButton ID='LinkButton1' runat="server" Text="Reviews"></asp:LinkButton></li>
<li class="leftsidebaritem sidebaritems">
<asp:LinkButton ID='LinkButton2' runat="server" Text="Other"></asp:LinkButton></li>
</ul>
<br />
</ItemTemplate>
</asp:DataList>
</asp:Content>
And in the codebehind:
Protected Sub customers_ItemCommand(source As Object, e As DataListCommandEventArgs) Handles customers.ItemCommand
'Hide all subitems
For Each itm As DataListItem In customers.Items
If itm.ItemType = ListItemType.Item OrElse itm.ItemType = ListItemType.AlternatingItem Then
Dim ulSubItems As HtmlGenericControl = CType(itm.FindControl("ulSubItems"), HtmlGenericControl)
ulSubItems.Visible = False
End If
Next
If e.CommandName = "LoadCompany" Then
Dim MySubItems As HtmlGenericControl = CType(e.Item.FindControl("ulSubItems"), HtmlGenericControl)
If Not MySubItems Is Nothing Then
MySubItems.Visible = True
End If
End If
End Sub