Get value of dynamic textbox when button click

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                              Get value of  dynamic textbox  when button click


<html>
<head id="Head1" runat="server">
    <title>sample</title>

    <script runat="server">
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {

                var lstTextBox = new List<TextBox>();

                for (int i = 0; i <= 4; i++)
                {
                    TextBox txtbx = new TextBox();
                    txtbx.ID = string.Format("txtbx{0}", i);
                    // txtbx.AutoPostBack = true;
                    lstTextBox.Add(txtbx);
                    txtbx.Text = "initial value" + i.ToString();
                    Panel1.Controls.Add(txtbx);
                }
                Session["lstTextBox"] = lstTextBox;

            }
            else
            {
                List<TextBox> lstTextBox = (Session["lstTextBox"] as List<TextBox>);
                foreach (TextBox tb in lstTextBox)
                {
                    Panel1.Controls.Add(tb);
                }
            }
        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            List<TextBox> lstTextBox = (Session["lstTextBox"] as List<TextBox>);

            string lblResult = "";
            var p = form1.FindControl("Panel1");
            foreach (var item in lstTextBox)
            {
                TextBox tb = item as TextBox;
                var theTextBox = (TextBox)Panel1.FindControl(tb.ID);
                lblResult += theTextBox.Text;
            }

            lbltest.Text= lblResult;
        }
    
    </script>

</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:Panel runat="server" ID="Panel1" />
            <br />
            <asp:Button runat="server" ID="Button1" OnClick="Button1_Click" Text="click" />
            <br />
            <asp:Label runat="server" ID="lbltest" Text="default text" />

        </div>
    </form>
</body>
</html>

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