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BaseDataBoundControl.OnDataPropertyChanged Method

Rebinds the data-bound control to its data after one of the base data source identification properties changes.

Namespace:  System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

'Declaration
Protected Overridable Sub OnDataPropertyChanged

ExceptionCondition
HttpException

An attempt was made to change the property value during the data-binding phase of the control.

The OnDataPropertyChanged method is called when the DataSource, DataSourceID, or DataMember property value changes any time after the page's PreRender event has occurred.

The following code example shows a property that belongs to a derived data-bound control class. The 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 DataBoundControl class.

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

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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