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.NET Framework Class Library

Control.HasChildViewState Property

Gets a value indicating whether the current server control's child controls have any saved view-state settings.

Namespace:  System.Web.UI
Assembly:  System.Web (in System.Web.dll)
Protected ReadOnly Property HasChildViewState As Boolean

Property Value

Type: System.Boolean
true if any child controls have saved view state information; otherwise, false.

You can avoid unnecessary calls to the ClearChildViewState method by using this property to verify that any child controls of the server control are storing view-state information.

Public Overrides Sub DataBind()
   MyBase.OnDataBinding(EventArgs.Empty)
   ' Reset the control's state.
   Controls.Clear()
   ' Check for HasChildViewState to avoid unnecessary calls to ClearChildViewState. 
   If HasChildViewState Then
      ClearChildViewState()
   End If
   ChildControlsCreated = True 
   If Not IsTrackingViewState Then
      TrackViewState()
   End If 
End Sub

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1