using System;

using System.Collections.Generic;

using System.Linq;

class Employee { public int EmpID {get;set;} public string Name {get;set;} public DateTime DateofPresentation {get;set;} public List<Employee> Others {get;set;} }  

​

​

List<Employee> employees = new List<Employee>() 

{

    new Employee { EmpID = 1 , Name ="AC", DateofPresentation = new DateTime(2013,12,24), Others = new List<Employee>()}                ,

    new Employee { EmpID = 1 , Name ="AC", DateofPresentation = new DateTime(2013,12,23), Others = new List<Employee>()},        

    new Employee { EmpID = 1 , Name ="AC", DateofPresentation = new DateTime(2013,12,22), Others = new List<Employee>()},

};

​

var all = employees

    .GroupBy(x => x.EmpID)

    .Select(g => {

        var byPres = g.OrderByDescending(x => x.DateofPresentation).ToArray();

        var e = byPres.First();

        e.Others = byPres.Skip(1).ToList();

        return e;

    })

    .ToList();

​

foreach (var e in all)

{

    Console.WriteLine("Emp: {0}, Date: {1}", e.EmpID, e.DateofPresentation);

    foreach (var o in e.Others)

    {

        Console.WriteLine("\tEmp: {0}, Date: {1}", o.EmpID, o.DateofPresentation);

    }

}