EthemineTelegramBotCore/EthermineBotTelegramCore/JsonDownloader.cs

using System;
using System.Collections.Generic;
using System.Net;
using Newtonsoft.Json;

namespace EthermineBotTelegramCore
{
     public class JsonDownloader
    {
        public static T _download_serialized_json_data<T>(string url) where T : new() {
            using (var w = new WebClient()) {
                var jsonData = string.Empty;
                // attempt to download JSON data as a string
                try
                {
                    jsonData = w.DownloadString(url);
                    jsonData = jsonData.Replace("null", "0");

                }
                catch (Exception) { }
                // if string with JSON data is not empty, deserialize it to class and return its instance 
                return !string.IsNullOrEmpty(jsonData) ? JsonConvert.DeserializeObject<T>(jsonData) : new T();
            }
        }
    }
}