How to get output of http request in JSON file?

I am making a http get request to a url and I am able to get data from that web page but I am not able to store it in JSON format and also not able to interpret data and get the required data.I am using ASP.NET and C# for it.

This is code for my CS file:

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.IO;
using Newtonsoft.Json;

namespace httprequest_web
{
    public partial class req : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            try
            {
                string baseu = "http://railenquiry.in/runningstatus/";

                string url = string.Concat(baseu, TextBox1.Text);
                var request = WebRequest.Create(url);
                string text;
                var response = (HttpWebResponse)request.GetResponse();

                using (var sr = new StreamReader(response.GetResponseStream()))
                {
                    request.ContentType = "application/json; charset=utf-8";
                    text = sr.ReadToEnd();
                }
                Label1.Text = text;
            }
            catch
            {
                Label1.Text = "No Data Found";
            }
            }

        }
    }

and screenshot of output I am receiving is:
enter image description here

I want to take output in a well structured JSON file and only want name of station, time of arrival and time of departure in it. Please tell me how to do it?


Source: json

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