HierarchicalDataBoundControl.OnDataPropertyChanged Method

protected:
 override void OnDataPropertyChanged();

protected override void OnDataPropertyChanged();

override this.OnDataPropertyChanged : unit -> unit

Protected Overrides Sub OnDataPropertyChanged ()

The following code example demonstrates how a data-bound control can call the OnDataPropertyChanged method if a property that identifies a data source is changed after the data-bound control is initialized. This code example is part of a larger example provided for the HierarchicalDataBoundControl class.

public string DataTextField {
    get {
        object o = ViewState["DataTextField"];
        return((o == null) ? string.Empty : (string)o);
    }
    set {
        ViewState["DataTextField"] = value;
        if (Initialized) {
            OnDataPropertyChanged();
        }
    }
}

Public Property DataTextField() As String
    Get
        Dim o As Object = ViewState("DataTextField")
        If o Is Nothing Then
            Return String.Empty
        Else
            Return CStr(o)
        End If
    End Get
    Set(ByVal value As String)
        ViewState("DataTextField") = value
        If Initialized Then
            OnDataPropertyChanged()
        End If
    End Set
End Property

The OnDataPropertyChanged method is called when the DataSource or DataSourceID is changed any time after the page's PreRender event.