Fill DropDownList with Dates based on Start and End Date ranges in DetailsView Control

<asp:DetailsView ID="DetailsView1" runat="server" Height="50px" Width="125px" OnDataBound = "OnDataBound" AutoGenerateRows = "false">
            <Fields>
                  <asp:TemplateField HeaderText = "Start Date">
                    <ItemTemplate>
                        <asp:Label ID="lblStartDate" runat="server" Text='<%# Eval("StartDate") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                 <asp:TemplateField HeaderText = "End Date">
                    <ItemTemplate>
                        <asp:Label ID="lblEndDate" runat="server" Text='<%# Eval("EndDate") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText = "Date Ranges">
                    <ItemTemplate>
                        <asp:DropDownList ID="ddlDates" runat="server">
                        </asp:DropDownList>
                    </ItemTemplate>
                </asp:TemplateField>
            </Fields>
        </asp:DetailsView>

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[2] { new DataColumn("StartDate"), new DataColumn("EndDate") });
            dt.Rows.Add(Convert.ToDateTime("01/01/2013"), Convert.ToDateTime("01/04/2013"));
            DetailsView1.DataSource = dt;
            DetailsView1.DataBind();
        }
    }

    protected void OnDataBound(object sender, EventArgs e)
    {
        Label lblStartDate = DetailsView1.FindControl("lblStartDate") as Label;
        Label lblEndDate = DetailsView1.FindControl("lblEndDate") as Label;
        DropDownList ddlDates = DetailsView1.FindControl("ddlDates") as DropDownList;
        DateTime startDate = Convert.ToDateTime(lblStartDate.Text);
        DateTime endDate = Convert.ToDateTime(lblEndDate.Text);
        int difference = endDate.Subtract(startDate).Days;
        for (int i = 0; i <= difference; i++)
        {
            ddlDates.Items.Add(new ListItem(startDate.AddDays(i).ToString(), startDate.AddDays(i).ToString()));
        }
    }