Occurs before a data retrieval operation.
Assembly: System.Web (in System.Web.dll)
Handle the event to perform additional initialization operations that are specific to your application, to validate the values of parameters, or to change the parameter values before the SqlDataSource control performs the select operation. The select arguments are available from the SqlDataSourceSelectingEventArgs object that is associated with the event.
For more information about handling events, see Consuming Events.
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.