.NET Framework (current version)
Handles the OnChange event that is fired when a notification is received for any of the commands associated with a SqlDependency object.
System.Data (in System.Data.dll)
public delegate void OnChangeEventHandler(
The OnChange event does not necessarily imply a change in the data. Other circumstances, such as time-out expired and failure to set the notification request, also generate OnChange.
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Available since 2.0