Gets or sets a value that specifies whether event validation is enabled.
Assembly: System.Web (in System.Web.dll)
The attribute indicates whether event validation should be performed. The default value is true. A Web application can optionally disable event validation to revert to .NET Framework version 1.0 behavior.
The base control checks this attribute to determine whether it should validate events. A derived control does not inherit this base control attribute, and so it is exempt from event validation by default. You still instruct ASP.NET to perform event validation on the derived control by adding the attribute to the derived control itself and setting it to true.
Event validation reduces the risk of unauthorized postback requests and callbacks. It instructs ASP.NET to validate only those events that can be raised in the control during a postback request or callback. With this model, a control registers its events during rendering and then validates the events during the post-back or callback handling. All event-driven controls in ASP.NET use this feature by default.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.