public ActionResult CreateSubGr()
{
ScheduleContext sc = new ScheduleContext();
List <EditUserViewModel> listst = sc.GetStudents();
var studGroups = from stud in listst group stud by stud.Group;
List <string> groups = new List <string>();
foreach (IGrouping <string, EditUserViewModel> g in studGroups)
{
groups.Add(g.Key);
}
ViewData["ListStud"] = new SelectList(groups);
return(View("SubGroupView"));
}