What is the best way to lock cache in asp.net?

Question

I know in certain circumstances, such as long running processes, it is important to lock ASP.NET cache in order to avoid subsequent requests by another user for that resourc

Answer 1

I saw one pattern recently called Correct State Bag Access Pattern, which seemed to touch on this.

I modified it a bit to be thread-safe.

http://weblogs.asp.net/craigshoemaker/archive/2008/08/28/asp-net-caching-and-performance.aspx

private static object _listLock = new object();

public List List() {
    string cacheKey = "customers";
    List myList = Cache[cacheKey] as List;
    if(myList == null) {
        lock (_listLock) {
            myList = Cache[cacheKey] as List;
            if (myList == null) {
                myList = DAL.ListCustomers();
                Cache.Insert(cacheKey, mList, null, SiteConfig.CacheDuration, TimeSpan.Zero);
            }
        }
    }
    return myList;
}