Considerations for caching in BizTalk

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Threading;

namespace BizTalkCaching
{
	public static class CacheSaravana
	{
		private static Random _random = new Random(Environment.TickCount);
		private static Dictionary<string, string> _authorIds = null;

		public static string GetAuthorName(string authorId)
		{
			if (_authorIds == null)
			{
				Debug.WriteLine("Cache is empty. So populating the cache...");
				_authorIds = new Dictionary<string, string>();
				lock (_authorIds)
				{

					// sandwitching in some delay
					_authorIds.Add("2FC0CF1D-E107", "Matthew Johnstone");
					Thread.Sleep(_random.Next(0, 1));
					_authorIds.Add("71F5C860-80FA", "Carl Reynolds");
					Thread.Sleep(_random.Next(0, 1));
					_authorIds.Add("158FF294-1A89", "Robert Perkins");
					Thread.Sleep(_random.Next(0, 1));
					_authorIds.Add("A71AE681-9C39", "Michael Killey");
					Thread.Sleep(_random.Next(0, 1));
					_authorIds.Add("58794661-A9A3", "Saravana Kumar");
					Thread.Sleep(_random.Next(0, 1));
				}
			}
			else
			{
				Debug.WriteLine("Cache list is pre-populated. Value is going to be taken from the cache.");
			}
			string authName = _authorIds[authorId];
			if (authName != string.Empty)
				return authName;
			else
				throw new Exception("Author cannot be found with id :" + authorId);
		}
	}
}