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Editorial Team
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Asked: 2026-05-20T14:12:19+00:00

Rather than poll against some tables, I’d like to signal a waiting c# app

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Rather than poll against some tables, I’d like to signal a waiting c# app that there are new rows to be processed in a table, maybe via a trigger. Is there some way for the database to signal to a console app, or am I stuck polling the table looking for new rows?

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1 Answer

  1. Editorial Team

    Take a look at Query Notifications (SQL Server 2005+).

    Microsoft SQL Server 2005 introduces
    query notifications, new functionality
    that allows an application to request
    a notification from SQL Server when
    the results of a query change. Query
    notifications allow programmers to
    design applications that query the
    database only when there is a change
    to information that the application
    has previously retrieved.

    There is an example here of how to write a simple form app to register a query for notification: http://msdn.microsoft.com/en-us/library/a52dhwx7(VS.80).aspx.

    This does require the Service Broker to be enabled on the database.

    You should take a look at the notes in the Remarks section of the MSDN SqlDependency documentation to make sure it is the right choice for your scenario

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