using System;

using System.Collections.Generic;

using System.Linq;

using System.Reflection;

​

// Program 

// -----------------------------------------------------------------

​

string input = "Teacher";

Type inputType = Assembly.GetExecutingAssembly().GetTypes().FirstOrDefault(t => t.Name == input);

​

if (inputType == null)

    throw new ArgumentOutOfRangeException(nameof(input), "It must be Student or Teacher.");

​

var listOfPersons = PersonProvider.AvailablePersons.Where(p => p.GetType() == inputType)                                

                                .ToList();

​

foreach (var item in listOfPersons)

    Console.WriteLine(item.Name);

​

// Model 

// -----------------------------------------------------------------

​

public abstract class Person {

    public string Name { get; set; }

}

​

public class Student : Person {

    public string ClassName { get; set; }

}

​

public class Teacher : Person {

    public decimal Salary { get; set; }

}

​

public static class PersonProvider {

    public static IEnumerable<Person> AvailablePersons => new List<Person>()

    {

        new Student() { Name = "Student 1", ClassName = "A" },

        new Student() { Name = "Student 2", ClassName = "A" },

        new Student() { Name = "Student 3", ClassName = "A" },

        new Student() { Name = "Student 4", ClassName = "B" },

        new Student() { Name = "Student 5", ClassName = "C" },

        new Teacher() { Name = "Teacher 1", Salary = 40000m },

        new Teacher() { Name = "Teacher 2", Salary = 42000m },

    };

}

​