c# - How to get List data from class to Form -

how can var finalquestions class question groupexmstart form in string questionset = "";? how can in form , conversions need store string? want store string because questionset have pass here: int z = quiz(questionset);,how this? better way can achieve this?

groupexmstart form

public partial class groupexmstart : form {     string questionset = "";     public groupexmstart(string groupname, string durationid)     {         initializecomponent();          this.grpid=groupname;         topiid=db.gettopicidforgroup(grpid);          question qsn = new question();                     string[] conf = db.getconfiguration(convert.toint16(durationid)).split('|');         qsn.foo(topiid, conf);         int z = quiz(questionset);     }      int quiz(string data)     {         string[] words = data.split('$');         randomqsn = new string[totqsn + 1];         qanda = new string[words.length + 1];         (int = 0; < words.length; i++)         {             qanda[i] = words[i];         }          return 0;     }      private void question(string id, string q, string op1, string op2, string op3, string op4)     {         label5.text = q;          radiobutton12.text = op4;         radiobutton11.text = op4;         radiobutton10.text = op4;         radiobutton9.text = op4;     } } 

class question

public class question {     public string id { get; set; }     public string text { get; set; }      public string option1 { get; set; }     public string option2 { get; set; }     public string option3 { get; set; }     public string option4 { get; set; }      public string answeroption { get; set; }     public int marks { get; set; }     random _random = new random();      public ienumerable<question> getquestions(string topicid, int marks)     {                     string sql = "select qid,question,opt1,opt2,opt3,opt4,ansop,marks questions topicid in(" +                          topicid + ") , marks=" + marks.tostring();         var cmd = new oledbcommand(sql,acccon);         var rs = cmd.executereader();          if (rs != null)         {             while (rs.read())             {                 yield return                 new question                 {                     id = rs[0].tostring(),                     text = rs[1].tostring(),                     option1 = rs[2].tostring(),                     option2 = rs[3].tostring(),                     option3 = rs[4].tostring(),                     option4 = rs[5].tostring(),                     answeroption = rs[6].tostring(),                     marks = marks                  };              }         }     }      public void foo(string topicid,string[] conf)     {         var totqsn = convert.toint16(conf[0]);          var mark1qsn = convert.toint16(conf[3]); //this variable contains number of question display of mark 1         var mark2qsn = convert.toint16(conf[4]);         var mark3qsn = convert.toint16(conf[5]);         var mark4qsn = convert.toint16(conf[6]);          var mark1questionset = getquestions(topicid, 1).tolist();         var mark2questionset = getquestions(topicid, 2).tolist();          //this finalquestions want access in form                        var finalquestions = new list<question>();          (int = 0; < mark1qsn; i++)         {             var setindex = _random.next(mark1questionset.count);             finalquestions.add(mark1questionset[setindex]);             mark1questionset.removeat(setindex);         }          (int = 0; < mark2qsn; i++)         {             var setindex = _random.next(mark2questionset.count);             finalquestions.add(mark2questionset[setindex]);             mark2questionset.removeat(setindex);         }                 }         }     

have method foo return final questions variable...

public list<question> foo(string topicid, string[] conf) {     // same stuff...     return finalquestions; } 

then, in groupexmstart method following...

question qsn = new question(); string[] conf = db.getconfiguration(convert.toint16(durationid)).split('|'); questionset = string.join(",", qsn.foo(topiid, conf)); int z = quiz(questionset); 

edit per comment #1

a better way, imo, not join them begin with; , pass list of questions quiz method directly. have alter quiz method take list of questions like:

int quiz(list<question> questions) 

and remove string.join above.

question qsn = new question(); string[] conf = db.getconfiguration(convert.toint16(durationid)).split('|'); var questions = qsn.foo(topiid, conf); int z = quiz(questions); 

edit per comment #3

private void question(question q) {     label5.text = string.format("{0} {1}", q.id, q.text);      radiobutton12.text = q.option1;     radiobutton11.text = q.option2;     radiobutton10.text = q.option3;     radiobutton9.text = q.option4; }