Assembly: System.Web (in system.web.dll)
The HttpApplicationState class performs automatic locking and unlocking with the AllKeys and Count properties and the Add, Clear, Get, GetKey, Remove, RemoveAt and Set methods. However, explicitly using the Lock and UnLock methods when you have a series of operations may be more efficient.
The following example uses the Lock method and UnLock method to prevent other sessions from changing the value of two application variables until after the local session has changed them.
Application.Lock(); Application["MyCode"] = 21; Application["MyCount"] = Convert.ToInt32(Application["MyCount"]) + 1; Application.UnLock();
get_Application().Lock(); get_Application().set_Item("MyCode", new Integer(21)); get_Application().set_Item("MyCount", System.Convert.ToString( Convert.ToInt32(get_Application().get_Item("MyCount")) + 1)); get_Application().UnLock();