Raises events for the DropDownList control when postback occurs.
Assembly: System.Web (in System.Web.dll)
The ASP.NET page framework calls the method on a DropDownList control when the LoadPostData method indicates that the state of the list items has changed in the DropDownList control. The method calls the OnSelectedIndexChanged method to raise the SelectedIndexChanged event. Control developers can override the OnSelectedIndexChanged method to perform custom processing when the user selects items in the control.
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.