using System;

using System.Collections.Generic;

public class Program

{

    private static Dictionary<string,Student> Students = new Dictionary<string, Student>();

    public static void Main()

    {   

        var command = GetUserCommand();

        while (!string.IsNullOrEmpty(command))

        {

            switch(command)

            {

                case "add student":

                    AddStudent();

                    break;

                case "get student":

                    PrintStudent();

                    break;

                default:

                    Console.WriteLine("Unkown command");

                    break;

            }           

            command = GetUserCommand();

        }

    }

    public static string GetUserCommand()

    {

        Console.WriteLine("please enter a command");

        return Console.ReadLine();

    }

    public static void AddStudent()

    {

        Console.WriteLine("please enter the student ID");

        var studentID = Console.ReadLine();

        // Dictionary will prevent duplicates, uncomment below to include a check

        /*

        if (Students.ContainsKey(studentID))

        {

            Console.WriteLine("Student already added");

            return;

        }

        */

        Console.WriteLine("please enter the student Name");

        var studentName = Console.ReadLine();

        var newStudent = new Student() { StudentID = studentID, Name = studentName };

        Students.Add(newStudent.StudentID, newStudent);

    }

    public static void PrintStudent()

    {

        Console.WriteLine("please enter student ID");

        var studentID = Console.ReadLine();

        if (Students.ContainsKey(studentID))

        {

            var student = Students[studentID];

            Console.WriteLine(string.Format("ID = {0}, Name = {1}", student.StudentID, student.Name));

        }

        else

        {

            Console.WriteLine("Student Not Found");

        }

    }

}

​

public class Student

{

    public string Name { get; set; }

    public string StudentID { get; set; }

}

​

​