Considerations for caching in BizTalk

using System;
using System.Collections.Generic;
using System.Text;

namespace BizTalkCaching
{
	public class Cache3
	{
		private static Cache3 _instance = null;
		private Dictionary<int, int> _numbers = new Dictionary<int, int>();
		private static object _padlock = new object();

		public Dictionary<int, int> Numbers
		{
			get { return _numbers; }
		}

		private Cache3()
		{
			DataStoreSimulator store = new DataStoreSimulator();
			store.LoadCache(_numbers);														
		}

		public static Cache3 Instance
		{
			get
			{
				lock (_padlock)
				{
					if (_instance == null)
					{
						_instance = new Cache3();
					}
				}
				return _instance;
			}
		}
	}
}