DataSourceView.CanUpdate Property


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Gets a value indicating whether the DataSourceView object associated with the current DataSourceControl object supports the ExecuteUpdate operation.

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

Public Overridable ReadOnly Property CanUpdate As Boolean

Property Value

Type: System.Boolean

true if the operation is supported; otherwise, false. The default implementation returns false.

The CanUpdate property reflects not only a capability of the data source control, but also whether it is currently appropriate to perform an operation. For example, even though a data-bound control supports the ExecuteUpdate operation, if a required update command or some other data is not set, the CanUpdate property returns false, as an update operation would fail.

The following code example demonstrates how to override the CanUpdate property and the ExecuteUpdate method in a class that extends the DataSourceView class. This code example is part of a larger example provided for the DataSourceView class.

   ' The CsvDataSourceView does not currently
   ' permit update operations. You can modify or
   ' extend this sample to do so.
   Public Overrides ReadOnly Property CanUpdate() As Boolean
         Return False
      End Get
   End Property

   Protected Overrides Function ExecuteUpdate(keys As IDictionary, _
                                              values As IDictionary, _
                                              oldValues As IDictionary) As Integer
      Throw New NotSupportedException()
   End Function 'ExecuteUpdate

End Class 'CsvDataSourceView

.NET Framework
Available since 2.0
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