Accessing a specific control(s) on the Repeater Control

<asp:repeater ID="Repeater1" runat="server" >

            <ItemTemplate>

                <asp:Button ID="Button1" runat="server" Text="Button on row 1" />

                <asp:TextBox ID="TextBox1" runat="server" Text="Text on row 2" />

                <br />

            </ItemTemplate>

        </asp:repeater>

if (!Page.IsPostBack)

        {

            ArrayList arr = new ArrayList();

            arr.Add(1);

            arr.Add(2);

            arr.Add(3);

            arr.Add(4);

            arr.Add(5);

            arr.Add(6);



            Repeater1.DataSource = arr;

            Repeater1.DataBind();

        }

foreach (RepeaterItem rptItem in Repeater1.Items)

        {

            TextBox textbox = (TextBox)rptItem.FindControl("TextBox1");

           //Do something with the TextBox

        }