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The SqlDataReader.RecordsAffected property is not set until all rows are read and you close the System.Data.SqlClient.SqlDataReader.
The value of this property is cumulative. For example, if two records are inserted in batch mode, the value of RecordsAffected will be two.
SqlDataReader.IsClosed and SqlDataReader.RecordsAffected are the only properties that you can call after the System.Data.SqlClient.SqlDataReader is closed.