How to create a object from collection after grouping

this is what i did 

 

var stData= results.GroupBy(s=> new { s.Id, s.Name})
.Select(grp => new Student{
Id= grp.Key.Id,
Name= grp.Key.Name,
Courses = grp.Select(x=>new Course
{
Name = x.CourseName,
Status = x.CourseStatus
}).ToList()
}); 

var result = from cx in results

group cx by cx.ID into cxGroup

orderby cxGroup.Key

select cxGroup;

foreach (var cxGroup in result) {

Console.WriteLine(String.Format("ID = {0}", cxGroup.Key));

foreach (var cx in cxGroup) {

Console.WriteLine(String.Format("\tName = {0}, CourseName = {1}, CourseStatus= {2}",

new object[] { cx.Name, cx.CourseName, cx.CourseStatus }));

}

}