using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        // Student collection

        List<Student> studentList = new List<Student>() { 

                new Student() { StudentID = 1, StudentName = null, Age = null } ,

                new Student() { StudentID = 2, StudentName = null,  Age = null } ,

                new Student() { StudentID = 3, StudentName = null,  Age = null } ,

                new Student() { StudentID = 4, StudentName = null , Age = null } ,

                new Student() { StudentID = 5, StudentName = null , Age = "koe" } 

            };

        var groupedResult = studentList.OrderByDescending(s => s.StudentName !=null && s.StudentName.Contains("Steve")).ThenByDescending(x=> x.Age !=null && x.Age.Contains("koe"));

​

        foreach (var ageGroup in groupedResult)

        {

                Console.WriteLine("Student Name: {0}", ageGroup.StudentID);

        }

    }

}

​

public class Student{

​

    public int StudentID { get; set; }

    public string StudentName { get; set; }

    public string Age { get; set; }

}