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All operations return the number of rows affected by the operation. The SqlDataSourceStatusEventArgs.AffectedRows property has the same value as the return value of the SqlDataSource.Update, SqlDataSource.Insert, and SqlDataSource.Delete methods.
When the SqlDataSource.Select(System.Web.UI.DataSourceSelectArguments) method is called and the data source is set to SqlDataSourceMode.DataReader mode, the return value is 0 in all cases.