Hii nauna,

Please refer below sample.

HTML

<asp:ListView ID="lvCustomers" runat="server">
    <ItemTemplate>
        <div id="dvhitem">
            <asp:Label ID="lblCustomerId" runat="server" Text='<%#Eval("CustomerId") %>'></asp:Label>
            <asp:Label ID="lblName" runat="server" Text='<%#Eval("Name") %>'></asp:Label>
            <asp:Label ID="lblCountry" runat="server" Text='<%#Eval("Country") %>'></asp:Label>
            <asp:LinkButton ID="lnkComparisionList" runat="server">Save</asp:LinkButton>
        </div>
        <hr />
    </ItemTemplate>
</asp:ListView>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $('[id*=lnkComparisionList]').on('click', function () {
            var item = $(this).closest('[id*=dvhitem]');
            var obj = {};
            obj.name = $(item).find('[id*=lblName]').html();
            obj.country = $(item).find('[id*=lblCountry]').html();
            $.ajax({
                type: "POST",
                url: "CS.aspx/Save",
                data: JSON.stringify(obj),
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (response) {

                },
                failure: function (response) {
                    alert(response.responseText);
                },
                error: function (response) {
                    alert(response.responseText);
                }
            });

            return false;
        });
    });
</script>

Namespaces

C#

using System.Data;
using System.Web.Services;
using System.Configuration;
using System.Data.SqlClient;

VB.Net

Imports System.Data
Imports System.Web.Services
Imports System.Configuration
Imports System.Data.SqlClient

Code

C#

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

private void BindListView()
{
    string constring = ConfigurationManager.ConnectionStrings["constring"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constring))
    {
        using (SqlCommand cmd = new SqlCommand("SELECT * FROM Customers", con))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
            {
                using (DataTable dt = new DataTable())
                {
                    sda.Fill(dt);
                    lvCustomers.DataSource = dt;
                    lvCustomers.DataBind();
                }
            }
        }
    }
}

[WebMethod]
public static void Save(string name, string country)
{
    string constring = ConfigurationManager.ConnectionStrings["constring"].ConnectionString;
    using (SqlConnection con = new SqlConnection(constring))
    {
        using (SqlCommand cmd = new SqlCommand("INSERT INTO Customers VALUES(@Name, @Country)", con))
        {                
            cmd.Parameters.AddWithValue("@Name", name);
            cmd.Parameters.AddWithValue("@Country", country);
            con.Open();
            cmd.ExecuteNonQuery();
            con.Close();
        }
    }
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Me.BindListView()
    End If
End Sub

Private Sub BindListView()
    Dim constring As String = ConfigurationManager.ConnectionStrings("constring").ConnectionString
    Using con As SqlConnection = New SqlConnection(constring)
        Using cmd As SqlCommand = New SqlCommand("SELECT * FROM Customers", con)
            Using sda As SqlDataAdapter = New SqlDataAdapter(cmd)
                Using dt As DataTable = New DataTable()
                    sda.Fill(dt)
                    lvCustomers.DataSource = dt
                    lvCustomers.DataBind()
                End Using
            End Using
        End Using
    End Using
End Sub

<WebMethod>
Public Shared Sub Save(ByVal name As String, ByVal country As String)
    Dim constring As String = ConfigurationManager.ConnectionStrings("constring").ConnectionString
    Using con As SqlConnection = New SqlConnection(constring)
        Using cmd As SqlCommand = New SqlCommand("INSERT INTO Customers VALUES(@Name, @Country)", con)
            cmd.Parameters.AddWithValue("@Name", name)
            cmd.Parameters.AddWithValue("@Country", country)
            con.Open()
            cmd.ExecuteNonQuery()
            con.Close()
        End Using
    End Using
End Sub

Screenshot