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HttpApplicationState.Lock Method

Locks access to an HttpApplicationState variable to facilitate access synchronization.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

public void Lock()

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.

How to: Save Values in Application StateBuilding ASP .NET Web Applications
How to: Save Values in Application StateBuilding ASP .NET Web Applications

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["MyCode"] = 21;
Application["MyCount"] = Convert.ToInt32(Application["MyCount"]) + 1;

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

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.