Export all rows from jQuery DataTable to Session using jQuery Ajax in ASP.Net

Hello, I can see the DataTables Rows on Alert with Your Support

Now I need to transfer the information in this row to List Class instead of warning If I Transfer to List Class I Will Use Where Required

How do I do this?

My codes are as follows

TemsilciSiparisIslemleri.aspx

<%@ Page Title="" Language="C#" MasterPageFile="~/TemsilciIslemleri.Master" AutoEventWireup="true" CodeBehind="TemsilciSiparisIslemleri.aspx.cs" Inherits="BilgiYonetimSistemi.TemsilciSiparisIslemleri" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
    <div class="container-fluid px-xl-5">
        <section class="py-5">
            <div class="row">
                <div class="col-lg-12 mb-4">
                    <div class="card">
                        <div class="card-header">
                            <h6 class="text-uppercase mb-0">Satış Temsilci Sipariş İşlemleri</h6>
                        </div>
                        <div class="card-body">
                            <div style="overflow-x: auto;">
                                <div>
                                    <asp:TextBox ID="TextBox1" runat="server" CssClass="form-control"></asp:TextBox>
                                    <br />
                                    <asp:TextBox ID="TextBox2" runat="server" CssClass="form-control"></asp:TextBox>
                                    <br />
                                    <asp:TextBox ID="TextBox3" runat="server" CssClass="form-control"></asp:TextBox>
                                    <br />
                                    <asp:Button ID="BTNSatisIslemleri" runat="server" CssClass="btn btn-primary shadow px-5 shadow form-control-range" Text="Ekle" OnClientClick="return false" />
                                    <br />
                                    <asp:TextBox ID="TextBox4" runat="server" CssClass="form-control"></asp:TextBox>
                                    <br />

                                </div>
                                <table id="SatisTemsilcisiSiparisListesi" class="table table-striped card-text">                                    
                                    <thead>
                                        <tr>
                                            <th scope="col">Name and Surname</th>
                                            <th scope="col">Age</th>
                                            <th scope="col">Country</th>
                                        </tr>
                                    </thead>
                                </table>
                                <br />
                                <asp:Button ID="BTNIslemTamamla" runat="server" CssClass="btn btn-primary shadow px-5 shadow form-control-range" Text="Tamamla" OnClick="BTNIslemTamamla_Click" OnClientClick="return false" />
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </section>
    </div>
    <script type="text/javascript">
        $(document).ready(function () {
            var table = $('[id*=SatisTemsilcisiSiparisListesi]').DataTable({
                "order": [[2, "asc"]],
                dom: 'Bfrtip',
                buttons: ['copy', 'csv', 'excel', 'pdf', 'print']
            });
            $('[id*=BTNSatisIslemleri]').click(function () {
                var rowNode = table
                    .row.add([$('[id*=TextBox1]').val(), $('[id*=TextBox2]').val(), $('[id*=TextBox3]').val()])
                    .draw()
                    .node();
                $(rowNode).css('color', 'black').animate({ color: 'black' });
            });
            $('[id*=BTNIslemTamamla]').click(function () {
                var customers = [];
                table.rows().data().each(function (value, index) {
                    var obj = {};
                    obj.Name = value[0];
                    obj.Age = value[1];
                    obj.Country = value[2];
                    customers.push(obj);
                });

                //Send the JSON array to WebMethod using AJAX.
                $.ajax({
                    type: "POST",
                    url: "TemsilciSiparisIslemleri.aspx/InsertCustomers",
                    data: '{ customers :' + JSON.stringify(customers) + '}',
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: function (r) {
                        alert(r.d + " record(s) inserted.");
                    }, error: function (r) {
                    }
                });
            });
        });
    </script>
</asp:Content>

TemsilciSiparisIslemleri.aspx.cs

using System;
using System.Collections.Generic;

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

        }

        [System.Web.Services.WebMethod]
        public static int InsertCustomers(List<SiparisListesi> customers)
        {
            // Rest of your code.
            return customers.Count;
        }

        protected void BTNIslemTamamla_Click(object sender, EventArgs e)
        {
            
        }        
    }
}

SiparisListesi.cs

using System.Collections.Generic;

namespace BilgiYonetimSistemi
{
    public class SiparisListesi
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public string Country { get; set; }
    }    
}