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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 ()
public void Lock ()
public function 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.

TopicLocation
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.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();

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

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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