implementing a giveaway in .net/c#

public class Global : System.Web.HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            // Set our user count to 0 when we start the server
            Application["HitCounter"] = 0;
        }

        protected void Session_Start(object sender, EventArgs e)
        {
            Application.Lock();
            Application["HitCounter"] = (int)(Application["HitCounter"]) + 1;
            Application.UnLock();
        }

        protected void Session_End(object sender, EventArgs e)
        {
            Application.Lock();
            Application["HitCounter"] = (int)(Application["HitCounter"]) - 1;
            Application.UnLock();
        }

        protected void Application_End(object sender, EventArgs e)
        {

        }
    }

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