Nested Repeaters in C#

page.aspx

<%@ Import Namespace="System.Data" %>

---

<asp:Repeater ID="Repeater1" runat="server">
    <ItemTemplate>
        <h2><%# DataBinder.Eval(Container, "DataItem[\"FirstLetter\"]")%></h2>
            <ul>
                <asp:Repeater ID="Repeater2" runat="server" 

				DataSource='<%# ((DataRowView)Container.DataItem).Row.GetChildRows("myrelation") %>'>
                        <ItemTemplate>
                        <li>
                            <%# DataBinder.Eval(Container.DataItem, "[\"LastName\"]")%>, 
                            <%# DataBinder.Eval(Container.DataItem, "[\"FirstName\"]")%>
                        </li>
                    </ItemTemplate>
                </asp:Repeater>
            </ul>
    </ItemTemplate>
</asp:Repeater>

page.cs

//create Dataset:
DataSet ds = new DataSet();

//Create the "Letter" DataTable:
DataTable dt = new DataTable();
dt.TableName = "Letters";
dt.Columns.Add(new DataColumn("FirstLetter", typeof(char)));

//Loop through Alpha
for (byte AlphaCtr = 65; AlphaCtr <= 90; AlphaCtr++) {
    dt.Rows.Add(System.Convert.ToChar(AlphaCtr));
}

ds.Tables.Add(dt);

// Get Person Table:
using (SqlConnection connection = new SqlConnection(Global.DatabaseConnection)) {
    connection.Open();
    SqlCommand command = connection.CreateCommand();
    command.CommandText = "select * from ExpertsList";
    
    DataTable dt2 = new DataTable();
    dt2.TableName = "ExpertsList";
    dt2.Load(command.ExecuteReader());

    //Modify Table to add "FirstLetter";
    dt2.Columns.Add(new DataColumn("FirstLetter", typeof(char)));
    foreach (DataRow dr in dt2.Rows) {
        dr["FirstLetter"] = Convert.ToString(dr["LastName"])[0];   // or set it to some other value
    }

    ds.Tables.Add(dt2);

    connection.Close();
}


//Create Relation and Bind:
ds.Relations.Add("myrelation", 
	ds.Tables["Letters"].Columns["FirstLetter"], 
    ds.Tables["ExpertsList"].Columns["FirstLetter"], 
    false);

Repeater1.DataSource = ds.Tables["Letters"];
Page.DataBind();