SqlNotificationSource Enumeration


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Indicates the source of the notification received by the dependency event handler.

Namespace:   System.Data.SqlClient
Assembly:  System.Data (in System.Data.dll)

public enum SqlNotificationSource

Member nameDescription

A client-initiated notification occurred, such as a client-side time-out or as a result of attempting to add a command to a dependency that has already fired.


Data has changed; for example, an insert, update, delete, or truncate operation occurred.


The database state changed; for example, the database related to the query was dropped or detached.


The run-time environment was not compatible with notifications; for example, the isolation level was set to snapshot, or one or more SET options are not compatible.


A run-time error occurred during execution.


A database object changed; for example, an underlying object related to the query was dropped or modified.


Internal only; not intended to be used in your code.


The Transact-SQL statement is not valid for notifications; for example, a SELECT statement that could not be notified or a non-SELECT statement was executed.


A system-related event occurred. For example, there was an internal error, the server was restarted, or resource pressure caused the invalidation.


The subscription time-out expired.


Used when the source option sent by the server was not recognized by the client.

The SqlNotificationSource enumeration is referenced by an instance of the SqlNotificationEventArgs class.

Query notifications are supported only for SELECT statements that meet a list of specific requirements. The following table provides links to the Service Broker and Query Notifications documentation in SQL Server Books Online.

SQL Server Books Online

.NET Framework
Available since 2.0
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