i try to put a lock to a static string object to access to cache,, the lock() block executes in my local,but whenever i deploy it to the server, it locks forever. i write every single step to event log to see the process and lock(object) just causes the deadlock on the server. The command right after lock() is never executed as the i dont see an entry in the event log. below is the code:

public static string CacheSyncObject = "CacheSync";
public static DataView GetUsers()
{

    DataTable dtUsers = null;
    if (HttpContext.Current.Cache["dtUsers"] != null)
    {
        Global.eventLogger.Write(String.Format("GetUsers() cache hit: {0}",dtUsers.Rows.Count));
        return (HttpContext.Current.Cache["dtUsers"] as DataTable).Copy().DefaultView;
    }

    Global.eventLogger.Write("GetUsers() cache miss");
    lock (CacheSyncObject)
    {
        Global.eventLogger.Write("GetUsers() locked SyncObject");

        if (HttpContext.Current.Cache["dtUsers"] != null)
        {
            Global.eventLogger.Write("GetUsers() opps, another thread filled the cache, release lock");
            return (HttpContext.Current.Cache["dtUsers"] as DataTable).Copy().DefaultView;
        }

全局.事件记录器.写入("GetUsers() 已锁定同步对象"); ==> 这从未被写入日志，这意味着lock()从未被执行。