C# JSON

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using DAL;
using System.Text;
namespace iosjson
{

    public partial class getpronumber : System.Web.UI.Page
    {
        public int count;
        public int pagecount;
        ProductsDAL prodal = new ProductsDAL();
        protected void Page_Load(object sender, EventArgs e)
        {

            if (!IsPostBack)
            {
                if (Request.QueryString["page"]!=null)
                {
                    int currentpage = int.Parse(Request.QueryString["page"].ToString());
                    DataTable dt = prodal.CutPage(currentpage, out pagecount, out count).Tables[0];
                    if (currentpage > count)
                    {
                        Response.Write("{\"result\":1}");
                    }
                    else
                    {

                        StringBuilder jsonBuilder = new StringBuilder();
                        jsonBuilder.Append("{\"");
                        jsonBuilder.Append("result\":\"0\",\"data");
                        jsonBuilder.Append("\":[");
                        for (int i = 0; i < dt.Rows.Count; i++)
                        {
                            jsonBuilder.Append("{");
                           
                            
                                jsonBuilder.Append("\"productnumber\":\"");
                                jsonBuilder.Append(dt.Rows[i]["ProductNumber"].ToString());
                                jsonBuilder.Append("\",");
                        
                            jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
                            jsonBuilder.Append("},");
                        }
                        jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
                        jsonBuilder.Append("]");
                        jsonBuilder.Append("}");
                        Response.Write(jsonBuilder.ToString());
                        Response.End();



                    }

                }
            }
          
        }
    }
}