How to create text box runtime in c#.net and how to add values of runtime generate tex box ?

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ASP.NET4

My problem is that I m unable to add the values of runtime generated textboxes ??
I have done it through javascript function but it's value get lost on simple page postback i want to do the same through c# code please help ???

What I have tried:

<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
    CodeFile="Default.aspx.cs" Inherits="_Default" %>

<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
    <script>

        var intTextBox = 0;

        //FUNCTION TO ADD TEXT BOX ELEMENT

        function addElement() {
            intTextBox = intTextBox + 1;

            var contentID = document.getElementById('content');

            var newTBDiv = document.createElement('div');

            newTBDiv.setAttribute('id', 'intData' + intTextBox);

            newTBDiv.innerHTML = "<center>L <input type='text' value='0' size='1' id='intHeight" + intTextBox + "' name='intHeight" + intTextBox + "'/>" + "B <input type='text' value='0' size='1' id='intWidth" + intTextBox + "' name='intWidth" + intTextBox + "'/>" + "H <input type='text' value='0' size='1' id='intBreadth" + intTextBox + "' name='intBreadth" + intTextBox + "'/>" + "Pcs <input type='text' value='0' size='1' id='intPcs" + intTextBox + "' name='intPcs" + intTextBox + "'/></center>";

            contentID.appendChild(newTBDiv);

            document.frm.txtMutiVolumetric.value = intTextBox;

            //	document.getElementById('intHeight'+i).focus();
        }



        //FUNCTION TO REMOVE TEXT BOX ELEMENT

        function removeElement() {
            if (intTextBox != 0) {
                var contentID = document.getElementById('content');

                contentID.removeChild(document.getElementById('intData' + intTextBox));

                intTextBox = intTextBox - 1;

                document.frm.txtMutiVolumetric.value = intTextBox;
            }
        }


        function sendInfo() {
            var intTotal;

            intTotal = 0;

            for (i = 1; i <= intTextBox; i++) {
                intTotal = intTotal + parseFloat(document.getElementById('intHeight' + i).value) * parseFloat(document.getElementById('intPcs' + i).value) * parseFloat(document.getElementById('intWidth' + i).value) * parseFloat(document.getElementById('intBreadth' + i).value);

                //		intTotal= intTotal ^ * 1/3;

                //		intTotal = document.frm.intHeight+i+.value
            }

            //	opener.frm1.txtHeight.value = document.frm.intHeight1.value;
            //	opener.frm1.txtWidth.value = document.frm.intWidth1.value;
            //	opener.frm1.txtBreadth.value = document.frm.intBreadth1.value;

            intTotal = Math.pow(intTotal, 1 / 3);


            var txtTLength = document.getElementById("<%=txtTLength.ClientID%>");

            var txtTBreadth = document.getElementById("<%=txtTBreadth.ClientID%>");

            var txtTHeight = document.getElementById("<%=txtTHeight.ClientID%>");

            // document.frm.txtHeight.value = intTotal;

            //document.frm.txtLength.value = intTotal;

            // document.frm.txtBreadth.value = intTotal;

            txtTLength.value = intTotal;

            txtTBreadth.value = intTotal;

            txtTHeight.value = intTotal;

            //	self.close();
        }
    </script>

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
    <asp:TextBox ID="txtAdd" runat="server">
    <asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" />
    <br />
    <br />
    <asp:Panel ID="pnlTextBoxes" runat="server">
    
    <br />
    <br />
    <br />
    <div id="content">
    </div>
    <br />
    <br />
    <br />
    <br />
    <a href="java<!-- no -->script:addElement();"><font color="#000000">Add</font> 
    </a>||<a href="java<!-- no -->script:removeElement();"><font color="#000000">Remove</font></a>||<a>
        href="java<!-- no -->script:sendInfo();"><font color="#000000">Calculate</font></a>
    <div id="Div1">
    </div>
    <br />
    <br />
    <br />
    L <asp:TextBox ID="txtTLength" runat="server" Width="85px" MaxLength="10" placeholder="L"
        ReadOnly="true">
    x B  <asp:TextBox ID="txtTBreadth" runat="server" Width="85px" MaxLength="10"
        placeholder="B" ReadOnly="true">
    x H  <asp:TextBox ID="txtTHeight" runat="server" Width="85px" MaxLength="10"
        placeholder="H" ReadOnly="true"> (In cm)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

  
    protected void Button1_Click(object sender, EventArgs e)
    {
         int count = Convert.ToInt32(txtAdd.Text.Trim());

        for (int i = 0; i < count; i++)
        {
            Label MyLabel = new Label();

            TextBox text1 = new TextBox();

            MyLabel.ID = "MyLabel" + i + 1;

            text1.ID = "Text" + i + 1;

            text1.Text = "0";

            MyLabel.Text = "L";

            pnlTextBoxes.Controls.Add(new LiteralControl("  "));

            pnlTextBoxes.Controls.Add(MyLabel);

            pnlTextBoxes.Controls.Add(text1);



            Label MyLabel2 = new Label();

            TextBox text2 = new TextBox();

            MyLabel2.ID = "MyLabel" + i + 2;

            text2.ID = "Text" + i + 2;

            text2.Text = "0";

            MyLabel2.Text = "B";

            pnlTextBoxes.Controls.Add(new LiteralControl("  "));

            pnlTextBoxes.Controls.Add(MyLabel2);

            pnlTextBoxes.Controls.Add(text2);



            Label MyLabel3 = new Label();

            TextBox text3 = new TextBox();

            MyLabel3.ID = "MyLabel" + i + 3;

            text3.ID = "Text" + i + 3;

            text3.Text = "0";

            MyLabel3.Text = "H";

            pnlTextBoxes.Controls.Add(new LiteralControl("  "));

            pnlTextBoxes.Controls.Add(MyLabel3);

            pnlTextBoxes.Controls.Add(text3);



            Label MyLabel4 = new Label();

            TextBox text4 = new TextBox();

            MyLabel4.ID = "MyLabel" + i + 4;

            text4.ID = "Text" + i + 4;

            text4.Text = "0";

            MyLabel4.Text = "Pcs";

            pnlTextBoxes.Controls.Add(new LiteralControl("  "));

            pnlTextBoxes.Controls.Add(MyLabel4);

            pnlTextBoxes.Controls.Add(text4);



            pnlTextBoxes.Controls.Add(new LiteralControl("  "));

            //Add a spacer in the form of an HTML <br /> element.
            pnlTextBoxes.Controls.Add(new LiteralControl("<br />"));
        }
    }
}