Not getting items from the list

i have 2 lists 1 juniorstudents , 1 seniorstudents. in juniorstudents have method promoting juniorstudent seniorstudent. first deleting juniorstudent , putting seniorstudent list. when try view student when calling method viewstudents not getting student. ideas why so. here code:

ublic class seniorstudentsclass      {          public list<student> studlist = new list<student>();    public void viewstudents()          {              (int = 0; < studlist.count; i++)              {                                 console.write(studlist[i].id + "\t");                  console.write(studlist[i].year + "\t");                  console.write(studlist[i].name + "\t");                  console.write(studlist[i].surname + "\t");                  console.write(studlist[i].dob + "\t");                  console.write(studlist[i].addr);                  console.writeline();              }      public class juniorstudentsclass      {         public list<student> mystudent = new list<student>();           seniorstudentsclass sc = new seniorstudentsclass();            public void promotestudents(int index)          {              searchitem(index);              console.writeline("current record:");              console.writeline("id is:" + mystudent[index].id);              console.writeline("year is:" + mystudent[index].year);              console.writeline("name is:" + mystudent[index].name);              console.writeline("surname is:" + mystudent[index].surname);              console.writeline("dob is:" + mystudent[index].dob);              console.writeline("address is:" + mystudent[index].addr);              console.writeline("year is:"+mystudent[index].year);              if (((mystudent[index].year== 7)) || ((mystudent[index].year == 8)))              {                  var student = mystudent[index];                  mystudent.removeat(index);                  sc.studlist.add(student);                  console.writeline("student promoted senior student");            }

as thought.

you promote student , add him cs.sc.studlist.

then call ss.viewstudents().

so have 2 seniorstudentclasses. 1 static in main class , 1 in juniorstudentclass.

either give juniorstudentclass access static seniorstudentclass or pass reference in method, e.g.: promotestudents(int index, ref seniorstudenclass ss);

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