aspx
<asp:Repeater ID="Repeater1" runat="server">
                                              <ItemTemplate>
                                                      <b><%#DataBinder.Eval(Container.DataItem, "parent_id")%></b><br>
                                                        <asp:Repeater ID="Repeater2" runat="server" datasource='<%# DirectCast(Container.DataItem,DataRowView).Row.GetChildRows("myrelation")%>'>
                                                                <ItemTemplate>
                                                                       <%# DataBinder.Eval(Container.DataItem, "categories_name")%> <br />
                                                                </ItemTemplate>
                                                        </asp:Repeater>
                                               </ItemTemplate>
                                     </asp:Repeater>

aspx.vb
        'Create the connection and DataAdapter for the Authors table.
        Dim cnn As New SqlClient.SqlConnection("Data Source=.\SQLEXPRESS;AttachDbFilename=C:\jaykay.net_29_Luglio\Visual Studio 2005\WebSites\jaykay_28_Luglio_2006\App_Data\ASPNETDB.MDF;Integrated Security=True;Connect Timeout=30;User Instance=True")
        Dim cmd1 As New SqlClient.SqlDataAdapter("select * from categories", cnn)

        'Create and fill the DataSet.
        Dim ds As New DataSet()
        cmd1.Fill(ds, "categories")

        'Create a second DataAdapter for the Titles table.
        Dim cmd2 As New SqlClient.SqlDataAdapter("select * from categories_description", cnn)
        cmd2.Fill(ds, "categories_description")

        'Create the relation bewtween the Authors and Titles tables.
        ds.Relations.Add("myrelation", ds.Tables("categories").Columns("categories_id"), ds.Tables("categories_description").Columns("categories_id"))


        'Bind the Authors table to the parent Repeater control, and call DataBind.
        Repeater1.DataSource = ds.Tables("categories")

        Page.DataBind()

        'Close the connection.
        cnn.Close()
        'page.Controls(0).Controls(4).Controls(1).Controls(1).Controls(15).Controls(1)