JsonHandler.ashx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;
using System.Runtime.Serialization.Json;
using System.IO;
using Newtonsoft.Json;
using EntityFrameworkLibrary;
namespace EntityFrameworkWeb
{
    /// <summary>
    /// Summary description for JsonHandler
    /// </summary>
    public class JsonHandler : IHttpHandler
    {

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "application/json";
            SampleEntities db = new SampleEntities();

            //long sampleId = Int64.Parse(context.Request["sampleId"]);
            //Sample sample = db.Samples.Single(s => s.SampleId == sampleId);
            
            //context.Response.Write("{");
            //context.Response.Write("  Sample{");
            //context.Response.Write(" \"sampleId\": " + sample.SampleId);
            //context.Response.Write(" \"sampleName\": " + sample.SampleName);
            //context.Response.Write(" \"sampleValue\": " + sample.SampleValue);
            //context.Response.Write("  }");
            //context.Response.Write("}");
           
            //JavaScriptSerializer serializer = new JavaScriptSerializer();
            //string json = serializer.Serialize(sample);
            //context.Response.Write(json);

            // IsReference=true problem
            //DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(Sample));
            //serializer.WriteObject(context.Response.OutputStream,sample);


            //Newtonsoft JSON.NET, Web Api
            //StringWriter sw = new StringWriter();
            //JsonTextWriter jw=new JsonTextWriter(sw);
            //JsonSerializer serializer = new JsonSerializer();
            //serializer.Serialize(jw, sample);
            //string json = sw.ToString();
            //context.Response.Write(json);


            //string json = JsonConvert.SerializeObject(sample,Formatting.Indented);
            //context.Response.Write(json);

            long categoryId = Int64.Parse(context.Request["categoryId"]);
            
            Category category = db.Categories.Single(c => c.CategoryId == categoryId);
            string json = JsonConvert.SerializeObject(category, Formatting.Indented);
            context.Response.Write(json);
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}