Registers a control as one whose control state must be persisted.
Assembly: System.Web (in System.Web.dll)
Custom server controls that use control state must call the method on each request because registration for control state is not carried over from request to request during a postback event. It is recommended that registration occur in the Init event.
The following code example shows a custom server control calling the method.
Class Sample Inherits Control Dim currentIndex As Integer Protected Overrides Sub OnInit(ByVal e As EventArgs) Page.RegisterRequiresControlState(Me) currentIndex = 0 MyBase.OnInit(e) End Sub Protected Overrides Function SaveControlState() As Object If currentIndex <> 0 Then Return CType(currentIndex, Object) Else Return Nothing End If End Function Protected Overrides Sub LoadControlState(ByVal state As Object) If (state <> Nothing) Then currentIndex = CType(state, Integer) End If End Sub End Class
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.