OnValidate Method

StateManagedCollection.OnValidate Method

When overridden in a derived class, validates an element of the StateManagedCollection collection.

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

protected virtual void OnValidate (
	Object value
protected void OnValidate (
	Object value
protected function OnValidate (
	value : Object
Not applicable.



The IStateManager to validate.

Exception typeCondition


value is a null reference (Nothing in Visual Basic).

The OnValidate method is called to validate the object manipulated through the StateManagedCollection implementation of the IList interface methods. The default implementation is to verify that the object manipulated by the collection is not a null reference (Nothing in Visual Basic); however, collections derived from StateManagedCollection override the OnValidate method to perform any additional validation, such as type-checking.

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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