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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Xml.Linq;
using System.Data.SqlClient;
using Newtonsoft.Json.Linq.JObject;


namespace returnjson2
{
    /// <summary>
    /// Summary description for Service1
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [ToolboxItem(false)]
    // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
    // [System.Web.Script.Services.ScriptService]
    public class Service1 : System.Web.Services.WebService
    {
        [WebMethod]

        public String getdata(String rollno)
        {
            String json;
            try
            {
               
                using (SqlConnection myConnection = new SqlConnection(@"Data Source=.\SQLEXPRESS;Initial Catalog=student;User ID=sa;Password=123"))
                {

                    string select = "select * from checkrecord where rollno=\'" + rollno + "\'";
                    SqlDataAdapter da = new SqlDataAdapter(select, myConnection);
                    DataSet ds = new DataSet();
                    da.Fill(ds, "checkrecord");
                    DataTable dt = new DataTable();
                    ds.Tables.Add(dt);
                    json = Newtonsoft.Json.JsonConvert.SerializeObject(ds);
                   

                     
                }
            }

            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return null;

            }

            return json;

        }



    }
}