Getting data from SqlDependency

No information is available about the rows that caused the dependency to be fired.

I guess as a workaround you could always put a timestamp on your records and track when the event was last fired.

Take a look at this component: SqlTableDependency

For every change done on a SQL Server database table, the C# code receive an event containing a list of RECORDs changed.

Find a very ingenious solution here