Export Repeater Control with TextBox in ItemTemplate to Excel in ASP.Net

Here I have created sample that exports repeater textbox to Excel.

HTML

<div>
    <asp:Repeater ID="rptCustomers" runat="server">
        <ItemTemplate>
            <asp:TextBox ID="TextBox1" runat="server" Text='<%#Eval("PostalCode")%>' />
        </ItemTemplate>
        <SeparatorTemplate>
        </SeparatorTemplate>
    </asp:Repeater>
    <br />
    <asp:Button ID="btnExport" runat="server" Text="Export" OnClick="ExportToExcel" />
</div>

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        this.BindCustomers();
    }
}

private void BindCustomers()
{
    DataTable dt = new DataTable();
    dt.Columns.AddRange(new DataColumn[1] { new DataColumn("Id", typeof(int)) });
    dt.Rows.Add(111);
    dt.Rows.Add(222);
    dt.Rows.Add(333);
    dt.Rows.Add(444);
    dt.Rows.Add(555);
    dt.Rows.Add(666);
    dt.Rows.Add(777);
    dt.Rows.Add(888);
    dt.Rows.Add(999);
    rptCustomers.DataSource = dt;
    rptCustomers.DataBind();
}
protected void ExportToExcel(object sender, EventArgs e)
{
    Response.Clear();
    Response.Buffer = true;
    Response.AddHeader("content-disposition", "attachment;filename=RepeaterExport.xls");
    Response.Charset = "";
    Response.ContentType = "application/vnd.ms-excel";
    using (StringWriter sw = new StringWriter())
    {
        HtmlTextWriter hw = new HtmlTextWriter(sw);
        foreach (RepeaterItem item in rptCustomers.Items)
        {
            List<Control> controls = new List<Control>();
            foreach (Control control in item.Controls)
            {
                controls.Add(control);
            }
            foreach (Control control in controls)
            {
                switch (control.GetType().Name)
                {
                    case "TextBox":
                        item.Controls.Add(new Literal { Text = (control as TextBox).Text });
                        break;
                }
                item.Controls.Remove(control);
            }
        }
        rptCustomers.RenderControl(hw);
        Response.Write(sw.ToString());
        Response.Flush();
        Response.End();
    }
}

Screenshot