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I have a lock in my c# web app that prevents users from running the update script once it has started. I was thinking I would put a notification in my master page to let the user know that the data isn't all there yet. Currently I do my locking like so. protected void butRefreshData_Click(object sender, EventArgs e) { Thread t = new Thread(new ParameterizedThreadStart(UpdateDatabase)); t.Start(this); //sleep for a bit to ensure that javascript has a chance to get rendered Thread.Sleep(100); } public static void UpdateDatabase(object con) { if (Monitor.TryEnter(myLock)) { Updater.RepopulateDatabase(); Monitor.Exit(myLock); } else { Common.RegisterStartupScript(con, AlreadyLockedJavaScript); } } And I do not want to do if(Monitor.TryEnter(myLock)) Monitor.Exit(myLock); else //show processing labal As I imagine there is a slight possibility that it might display the notification when it isn't actually running. Is there an alternative I can use? Edit: Hi Everyone, thanks a lot for your suggestions! Unfortunately I couldn't quite get them to work... However I combined the ideas on 2 answers and came up with my own solution. It seems to be working so far but I have to wait for the process to complete... Ok this seems to be working, I broke out the Repopule Method into it's own class. public static class DataPopulation { public static bool IsUpdating = false; private static string myLock = "My Lock"; private static string LockMessage = @"Sorry, the data repopulation process is already running and cannot be stopped. Please try again later. If the graphs are not slowly filling with data please contact your IT support specialist."; private static string LockJavaScript = @"alert('" + LockMessage + @"');"; public static void Repopulate(object con) {

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