jquery - MVC 4 and dataTables: checkbox entry returns null ViewModel -

what i'm trying first need display list of members need add group. user click on each checkbox each row of members user chooses. code running. problem is, when applied jquery.datatable (which renders too) doesn't seem return necessary data when of members hidden away (via next page or search). works fine when click show 100, showing every hidden data, of datatable.

my viewmodel

public class choosememberseditorviewmodel {     public bool selected { get; set; }     public string id { get; set; }     public string name { get; set; }     public string sex { get; set; }     public string age { get; set; }      public choosememberseditorviewmodel()     {         this.selected = false;         this.id = "";     } } 

which inside viewmodel

public class addmemberviewmodel {     public list<group> group{ get; set; }     public list<choosememberseditorviewmodel> lgmembers { get; set; }      public addlifegroupmemberviewmodel()     {         this.group= new list<group>();         this.lgmembers = new list<choosememberseditorviewmodel>();     }      public ienumerable<string> getselectedids()     {         var getselected = (from members in this.lgmembers                            members.selected                            select members.id); //returns error here saying value cannot null         system.diagnostics.debug.writeline(string.format("count {0}", getselected.count()));         return getselected;     } } 

when check 1 of values , hit add member, value must not null inside getselectedids linq

thank in advance!

edit

this how list members. submitselectedmembers gets members id's checked , adds them database.

[authorize(roles = "admin")]     public actionresult addlifegroupmembers(int id)     {         var model = new addlifegroupmemberviewmodel();          lifegroup lifegroup = db.lifegroup.find(id);          int leaderage = getage(lifegroup.lgleader.user.birthday);         viewbag.age = leaderage;          system.diagnostics.debug.writeline(string.format("{0}", lifegroup.lgname.tostring()));          var nonmembers = u in db.users                          !(from lgm in db.lgmember                                  select lgm.userid).contains(u.id) //should not part of lifegroup                                  &&                                !(from l in db.lifegroup                                  l.lifegroupid.equals(id)                                  select l.lgleader.userid).contains(u.id) //should not include leader of said group                          select u;          system.diagnostics.debug.writeline(string.format("number of lg: {0}", model.lifegroup.count()));          foreach (var user in nonmembers)         {             int age = getage(user.birthday);              var editorviewmodel = new choosememberseditorviewmodel()             {                 id = user.id,                 name = string.format("{0} {1}", user.firstname, user.lastname),                 selected = false,                 age = age.tostring(),                 sex = user.sex             };              model.lgmembers.add(editorviewmodel);         }         model.lifegroup.add(lifegroup);          return view(model);     }      public actionresult submitselectedmembers(addlifegroupmemberviewmodel model)     {         var getselected = (from members in model.lgmembers                            members.selected                            select members.id);          list<string> _selected = new list<string>();         foreach (var selected in getselected)         {             _selected.add(selected);         }          //var selectedids = model.getselectedids();         var lifegroupid = model.lifegroup[0].lifegroupid;          //system.diagnostics.debug.writeline(string.format("lifegroup id: {0}", model.lifegroup.lifegroupid));          var selectedusers = u in db.users                             //where selectedids.contains(u.id                             _selected.contains(u.id)                             select u;          foreach (var users in selectedusers)         {             var idmanager = new identitymanager();             idmanager.addusertorole(users.id, "lifegroupmember");              var lgmember = new lgmember()             {                 lifegroupid = lifegroupid,                 userid = users.id,                 datejoined = datetime.now             };              /*               *  insert code insert part of lifegroup growthmilestone                              */              db.lgmember.add(lgmember);         }         db.savechanges();          return redirecttoaction("viewlifegroups");     } 

you need instantiate objects before inserting them in lgmembers-list. isn't happening in code above.