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MachineKeySection.ValidationKey Property

Gets or sets the key that is used to validate encrypted data, or the process by which the key is generated.

Namespace: System.Web.Configuration
Assembly: System.Web (in system.web.dll)

[TypeConverterAttribute(typeof(WhiteSpaceTrimStringConverter))] 
public string ValidationKey { get; set; }
/** @property */
public String get_ValidationKey ()

/** @property */
public void set_ValidationKey (String value)

public function get ValidationKey () : String

public function set ValidationKey (value : String)

Not applicable.

Property Value

An encryption key value, or a value that indicates how the key is generated. The default is "AutoGenerate,IsolateApps".

The ValidationKey property is used when enableViewStateMAC is true to create a message authentication code to ensure that view state has not been tampered with. The ValidationKey property is also used to generate out-of-process, application-specific session IDs to ensure that session state variables are isolated between applications.

Use the "AutoGenerate" option to specify that ASP.NET generates a random key and stores it in the Local Security Authority. The "AutoGenerate" option is part of the default value.

If you add the IsolateApps modifier to the ValidationKey value, ASP.NET generates a unique encrypted key for each application by using each application's application ID. IsolateApps is also part of the default value.

If you need to support configuration across a network of Web servers (a Web farm), set the ValidationKey property manually to ensure consistent configuration.

The following example demonstrates how to use the ValidationKey property. This code example is part of a larger example provided for the MachineKeySection class.

// Display ValidationKey property.
Console.WriteLine("ValidationKey: {0}",
  configSection.ValidationKey);

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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