c# - Join Query in ACCESDB giving a IndexOutOfRangeException error -


i'm sure table names ok. want list of players of each team.

 public list<speler> getspelersperploeg(int ploegid)     {         list<speler> spelerslijst = new list<speler>();          connection.open();         oledbcommand command = new oledbcommand("select * proj1speler inner join proj1ploeg on proj1speler.ploegid = proj1ploeg.ploegid proj1ploeg.ploegid = @ploegid", connection);         command.parameters.add(new oledbparameter("@ploegid", ploegid));          oledbdatareader datareader = command.executereader();         while (datareader.read())         {             spelerslijst.add(new speler((int)datareader["spelerid"], datareader["spelernaam"].tostring(), (int)datareader["ploegid"], datareader["ploegnaam"].tostring(), (int)datareader["spelertypeid"]));         }          datareader.close();         connection.close();          return spelerslijst;     }

it trows error ploegid on line " spelerslijst.add(new speler((...", ideas?

and funny thing sql server works without problem, maybe relations in acces wrong?

you joining 2 tables using *, in way fields both tables returned query.

but happens when have 2 fields same name 2 different tables in same query? automatic renaming occurs, tablename added 2 identical field names disambiguate column name.

so when try use simple name (without table name) error. bet culprit "ploegid" field appears in both tables.

i suggest return field names required code

oledbcommand command = new oledbcommand(@"select ps.spelerid, ps.spelernaam,                                         pp.ploegid, pp.ploegnaam, ps.spelertypeid                                        proj1speler ps                                         inner join proj1ploeg pp                                         on ps.ploegid = pp.ploegid                                         pp.ploegid = @ploegid", connection);  command.parameters.add(new oledbparameter("@ploegid", ploegid));  oledbdatareader datareader = command.executereader();

(note, not sure field contained in table, idea)


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