[Solved] Linq join between two Lists [closed]

by 


var result = studentList
            .Join(markList, m => m.Id, s => s.Sid, (s, m) => new { s, m })
            .GroupBy(t => t.s)
            .Select(g => new 
            { 
                Student = g.Key, 
                MarksCount = g.Count(), 
                Marks = g.Select(x => x.m).ToList() 
            })
            .ToList();

MarksCount – total marks for this student
Marks – List of marks for this student

solved Linq join between two Lists [closed]