I am currently in the process of using an ODBC Connection and a Npgsql Connection to transfer a database from a Sybase/Advantage platform to a PostgreSQL platform using C# and the .NET framework. Below is the code I have come up with to transfer the data itself... NpgsqlCommand copyCommand = new NpgsqlCommand("COPY \"2009info.adt\" FROM STDIN", connectionTest); string query = "SELECT * FROM \"2009info.adt\""; OdbcCommand test = new OdbcCommand(query, myConnection); string dataEntry = ""; NpgsqlCopyIn copy = new NpgsqlCopyIn(copyCommand, connectionTest); copy.Start(); OdbcDataReader reader = test.ExecuteReader(); int rowCount = reader.FieldCount; while (reader.Read()) { for (int i = 0; i < rowCount; i++) { dataEntry = dataEntry + reader[i].ToString() + "|"; } dataEntry = dataEntry.Trim().Substring(0, dataEntry.Length - 1); dataEntry = dataEntry.Replace("\r", string.Empty).Replace("\n", string.Empty); var raw = Encoding.UTF8.GetBytes(dataEntry); copy.CopyStream.Write(raw, 0, raw.Length); dataEntry = ""; } copy.End(); However, nothing happens when this code compiles. And when I look at the log files I get the following errors. 2014-06-24 13:22:58 EDT CONTEXT: COPY 2009info.adt, line 1 2014-06-24 13:22:58 EDT STATEMENT: COPY "2009info.adt" FROM STDIN 2014-06-24 13:22:58 EDT ERROR: unexpected EOF on client connection with an open transaction 2014-06-24 13:22:58 EDT CONTEXT: COPY 2009info.adt, line 1 2014-06-24 13:22:58 EDT STATEMENT: COPY "2009info.adt" FROM STDIN 2014-06-24 13:22:58 EDT LOG: could not send data to client: No connection could be made because the target machine actively refused it. Anyone have any ideas why this is happening? -- View this message in context: http://postgresql.1045698.n5.nabble.com/Error-When-Trying-to-Use-Npgsql-to-COPY-into-a-PostgreSQL-Database-tp5808954.html Sent from the PostgreSQL - general mailing list archive at Nabble.com.