How to bind data in gridview in asp.net using javascript

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

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        this.BindDummyRow();
    }
}
 
private void BindDummyRow()
{
    DataTable dummy = new DataTable();
    dummy.Columns.Add("CustomerID");
    dummy.Columns.Add("ContactName");
    dummy.Columns.Add("City");
    dummy.Rows.Add();
    gvCustomers.DataSource = dummy;
    gvCustomers.DataBind();
}

WebMethod to handle jQuery AJAX

[WebMethod]
public static string GetCustomers()
{
    string query = "SELECT top 10 CustomerID, ContactName, City FROM Customers";
    SqlCommand cmd = new SqlCommand(query);
    return GetData(cmd).GetXml();
}
private static DataSet GetData(SqlCommand cmd)
{
    string strConnString = ConfigurationManager.ConnectionStrings["conString"].ConnectionString;
    using (SqlConnection con = new SqlConnection(strConnString))
    {
        using (SqlDataAdapter sda = new SqlDataAdapter())
        {
            cmd.Connection = con;
            sda.SelectCommand = cmd;
            using (DataSet ds = new DataSet())
            {
                sda.Fill(ds);
                return ds;
 
            }
        }
    }
}

Client side

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js">script>
<script type="text/javascript">
    $(function () {
        $.ajax({
            type: "POST",
            url: "Default.aspx/GetCustomers",
            data: '{}',
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: OnSuccess,
            failure: function (response) {
                alert(response.d);
            },
            error: function (response) {
                alert(response.d);
            }
        });
    });
 
    function OnSuccess(response) {
        var xmlDoc = $.parseXML(response.d);
        var xml = $(xmlDoc);
        var customers = xml.find("Table");
        var row = $("[id*=gvCustomers] tr:last-child").clone(true);
        $("[id*=gvCustomers] tr").not($("[id*=gvCustomers] tr:first-child")).remove();
        $.each(customers, function () {
            var customer = $(this);
            $("td", row).eq(0).html($(this).find("CustomerID").text());
            $("td", row).eq(1).html($(this).find("ContactName").text());
            $("td", row).eq(2).html($(this).find("City").text());
            $("[id*=gvCustomers]").append(row);
            row = $("[id*=gvCustomers] tr:last-child").clone(true);
        });
    }
script>