Write a Program To find out the highest marks of all students whose scores are high in each departments using LINQ

Here i would like to explore the implementation of LINQ.
Consider a List which contains Sid, Marks,SName, Dept of student.







Program:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Linq

{

    class Program

    {

        static void Main(string[] args)

        {

            List<MyClass> o = new List<MyClass>();

            o.Add(new MyClass { Sid = 1, SName = "ABC", Dept = "CSE", Marks = 90 });

            o.Add(new MyClass { Sid = 2, SName = "DEF", Dept = "CSE", Marks = 92 });

            o.Add(new MyClass { Sid = 3, SName = "GHI", Dept = "IT", Marks = 68 });

            o.Add(new MyClass { Sid = 4, SName = "JKL", Dept = "IT", Marks = 70 });

            o.Add(new MyClass { Sid = 5, SName = "MNO", Dept = "CSE", Marks = 99 });

            o.Add(new MyClass { Sid = 6, SName = "PQR", Dept = "CSE", Marks = 99 });

            o.Add(new MyClass { Sid = 7, SName = "STU", Dept = "IT", Marks = 96 });

            int CSEMARKS = (from p in o where p.Dept == "CSE" select p.Marks).Max();            

            int ITMarks = (from p in o where p.Dept == "IT" select p.Marks).Max();           

            List<MyClass> tempCse = new List<MyClass>();

            List<MyClass> tempIT = new List<MyClass>();

            int sno = 1;

            int itsno = 1;

            o.ToList().ForEach(p =>

                {                   

                    if (p.Dept == "CSE" && p.Marks == CSEMARKS)

                    {                       

                        p.Sid = sno;

                        tempCse.Add(p);

                        sno++;  

                    }

                    if (p.Dept == "IT" && p.Marks == ITMarks)

                    {

                        p.Sid = itsno;

                        tempIT.Add(p);

                        sno++;

                    }

                });

            Console.WriteLine("Students Whose Scores is hogh in CSE Branch is:");                    

            if (tempCse != null && tempCse.Count > 0)

            {

                foreach (var q in tempCse)

                {  

                    Console.WriteLine(q.Sid+"\t"+q.SName+"\t"+q.Dept+"\t"+q.Marks);

                }

            }

            Console.WriteLine("Students Whose Scores is hogh in IT Branch is:");

            if (tempIT != null && tempIT.Count > 0)

            {

                foreach (var q in tempIT)

                {                                         

                    Console.WriteLine(q.Sid + "\t" + q.SName + "\t" + q.Dept + "\t" + q.Marks);

                }

            }

            Console.ReadLine();

        }

    }

    class MyClass

    {

        public int Sid, Marks;

        public string SName, Dept;

    }

}

Output:

LINQ EXAMPLE