Simple wrapper for HTTP cache object.

ICacheService.cs

public class InMemoryCache : ICacheService
    {
        public T Get<T>(string cacheID, TimeSpan duration, Func<T> getItemCallback) where T : class
        {
            T item = HttpRuntime.Cache.Get(cacheID) as T;
            if (item == null)
            {
                item = getItemCallback();
                HttpContext.Current.Cache.Insert(cacheID, item, null, System.Web.Caching.Cache.NoAbsoluteExpiration, duration);
            }
            return item;
        }
    }

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