valm

public interface ICacheService
{
    T Get<T>(string cacheID, Func<T> getItemCallback) where T : class;
}

valm

Action<string> log;
Action clearLog;

log = (x =>
                {
                    x = DateTime.Now.ToString(@"hh\:mm\:ss") + " " + x;
                    txtLog.AppendText(String.IsNullOrWhiteSpace(txtLog.Text) == false ? Environment.NewLine + x : x);
                });
clearLog = (() => txtLog.Text = String.Empty);

valm

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Reactive.Linq;
using System.Text;
using System.Threading;