Locks access to an HttpApplicationState variable to facilitate access synchronization.
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 and UnLock methods when you have a series of operations may be more efficient.
The following example uses the method and UnLock method to prevent other sessions from changing the value of two application variables until after the local session has changed them.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.