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Asked: 2026-05-10T16:08:58+00:00

When trying to call Close or Dispose on an SqlDataReader i get a timeout

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When trying to call Close or Dispose on an SqlDataReader i get a timeout expired exception. If you have a DbConnection to SQL Server, you can reproduce it yourself with:

String CRLF = '\r\n'; String sql =      'SELECT * ' + CRLF +     'FROM (' + CRLF +     '   SELECT (a.Number * 256) + b.Number AS Number' + CRLF +     '   FROM    master..spt_values a,' + CRLF +     '       master..spt_values b' + CRLF +     '   WHERE   a.Type = 'p'' + CRLF +     '       AND b.Type = 'p') Numbers1' + CRLF +     '   FULL OUTER JOIN (' + CRLF +     '       SELECT (print('code sample');a.Number * 256) + b.Number AS Number' + CRLF +     '       FROM    master..spt_values a,' + CRLF +     '           master..spt_values b' + CRLF +     '       WHERE   a.Type = 'p'' + CRLF +     '           AND b.Type = 'p') Numbers2' + CRLF +     '   ON 1=1';  DbCommand cmd = connection.CreateCommand(); cmd.CommandText = sql; DbDataReader rdr = cmd.ExecuteReader(); rdr.Close();

If you call reader.Close() or reader.Dispose() it will throw a System.Data.SqlClient.SqlException:

  • ErrorCode: -2146232060 (0x80131904)
  • Message: ‘Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.’
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1 Answer

  1. it’s because you have just opened the data reader and have not completely iterated through it yet. you will need to .Cancel() your DbCommand object before you attempt to close a data reader that hasn’t completed yet (and the DbConnection as well). of course, by .Cancel()-ing your DbCommand, I’m not sure of this but you might encounter some other exception. but you should just catch it if it happens.

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