PostgreSQL: function returns multiple recordsets: how to read in c#? -

using link http://www.sqlines.com/postgresql/npgsql_cs_result_sets have created example, not work: there function:

 create or replace function show_cities_multiple()   returns setof refcursor $$     declare       ref1 refcursor;        ref2 refcursor;                                  begin       open ref1 select user_id, user_name users;       return next ref1;         open ref2 select id, company customers;       return next ref2;           end;     $$ language plpgsql; 

the 1st loop reads recordsets names , can read function.

         npgsqlconnection conn = new npgsqlconnection(getconnectionstring());                 conn.open();                 npgsqltransaction tran = conn.begintransaction();                 npgsqlcommand command = new npgsqlcommand("show_cities_multiple", conn);                 command.commandtype = commandtype.storedprocedure;                 npgsqldatareader dr = command.executereader();                 while (dr.read())                 {                    console.write("{0}\n", dr[0]);                 } // ----------there output - names of cursors recordsets // <unnamed portal 1> // <unnamed portal 2>                  dr.nextresult();  // there nothing read, no additional recordsets                 while (dr.read())                     console.write("{0}\t{1} \n", dr[0], dr[1]);                  tran.commit();                 conn.close(); 

what wrong? how read multiple recordsets pgsql function?

there few ways work cursors different versions

how can cursor data calling stored procedure in npgsql