How to Remove httpruntime Cache in c#

  var enumerator = HttpRuntime.Cache.GetEnumerator();
  Dictionary<string, object> cacheItems = new Dictionary<string, object>();
  while (enumerator.MoveNext())
      cacheItems.Add(enumerator.Key.ToString(), enumerator.Value);
  foreach (string key in cacheItems.Keys)
      HttpRuntime.Cache.Remove(key);