How can I hide a repeater in ASP.NET C# if the Dat

Question

I have an ASP.NET page that uses a repeater nested within another repeater to generate a listing of data. It's to the effect of the following:

<asp:Repeater>
    <ItemTemplate>
        <span><%#Eval("Data1") %></span>
        <!-- and many more -->
        <asp:Repeater DataSource='<%#Eval("Data2")%>'>
            <HeaderTemplate>
                <ul>
            </HeaderTemplate>
            <ItemTemplate>
                <li><%#Container.DataItem%></li>
            </ItemTemplate>
            <FooterTemplate>
                </ul>
            </FooterTemplate>
        </asp:Repeater>
    </ItemTemplate>
</asp:Repeater>

In the (C#) code-behind I'm basically using LINQ to pull a listing of information from an XML document and bind that information to the first repeater.

Searching for the answer to this, it seems the method is to determine whether the data for the nested repeater is empty. If it is, then you set the visibility of the repeater to false.

Unfortunately, I haven't been able to determine how to do that inline, and not in the code-behind (since it won't necessarily work for what I'm doing).

Since my pages aren't validating now, because the ul ends up being empty for any items without Data2, and because I'd like to keep using an unordered list, I seek your help.

Any ideas?

Thanks!

UPDATE:

If it helps, since it could very well be possible to do in the code-behind, the LINQ is something to this effect:

var x = from y in z
    select new {
        Data1 = d,
        // etcetera
        Data2 = (from j in k
            where j.Value != String.Empty
            select j.Value).ToList()
    };

blah.DataSource = x;
blah.DataBind();

Answer 1

use this:

protected void Repeater1_PreRender(object sender, EventArgs e)
{
    if (Repeater1.Items.Count < 1)
    {
        container.Visible = false;
    }
}

Answer 2

In the OnItemDataBound event, set visibility to false if ItemType is a Header and set visibility to true if ItemType is an Item.

Answer 3

As far as I know you must do this via the codebehind, just use the ItemDataBound event to handle it, you can leave pretty much everything as is, just simply input some logic that gets the dataset and determines if it has entries, if not hide the repeater.