Development Class C#

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace Mvc30WebRole1.Util
{
    public class CacheUtility
    {
        private static Dictionary MemCache = new Dictionary();
        private static Dictionary MemCacheLocks = new Dictionary();
        private static List keyNames = new List() { "AllLocations" };
        static CacheUtility()
        {
            foreach (string item in keyNames)
            {
                MemCache.Add(item, null);
                MemCacheLocks.Add(item, new object());
            }
        }
        public static T GetFromCacheOrAdd(string cacheKey, Func populateMethod)
        {
            if (MemCache[cacheKey] == null)
            {
                lock (MemCacheLocks[cacheKey])
                {
                    if (MemCache[cacheKey] == null)
                    {
                        MemCache[cacheKey] = populateMethod.Invoke();
                    }
                }
            }
            object cachedItem = MemCache[cacheKey];
            if (cachedItem == null)
                throw new Exception("Unable to retrieve item from cache with cacheKey '" + cacheKey + "'");
            return (T)cachedItem;
        }
        public static void RemoveCacheItem(string cacheKey)
        {
            MemCache[cacheKey] = null;
        }
        public static void RemoveAllFromCache()
        {
            foreach (string item in keyNames)
            {
                RemoveCacheItem(item);
            }
        }
    }
}