Remove cache in asp.net

The following code will remove all keys from the cache:

public void ClearApplicationCache(){

    List<string> keys = new List<string>();
    // retrieve application Cache enumerator
    IDictionaryEnumerator enumerator = Cache.GetEnumerator();
    // copy all keys that currently exist in Cache
    while (enumerator.MoveNext()){
        keys.Add(enumerator.Key.ToString());
    }
    // delete every key from cache
    for (int i = 0; i < keys.Count; i++) {
        Cache.Remove(keys[i]);
    }
}

Modifying the second loop to check the value of the key before removing it should be trivial.

Hope this helps.