c# - fields and properties

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    public class Student
    {
        private int _id;
        private string _name;
        public string Email { get; set; }

        public int Id
        {
            get { return _id; }
            set
            {
                if (value <= 0)
                {
                    throw new Exception("Student Id cannot be negative");
                }
                _id = value;
            }
        }

        public string Name
        {
            get { return _name; }
            set
            {
                if (string.IsNullOrEmpty(value))
                {
                    throw new Exception("Student name cannot be Null or Empty");
                }
                _name = value;
            }
        }
    }

    public class Program
    {
        static void Main(string[] args)
        {
            Student S1 = new Student();
            S1.Id = -101;
            S1.Name = "Tesla";
            S1.Email = "tesla@gmail.com";
            Console.WriteLine("The student info is: Id = {0}, Name = {1}, Email= {2}", S1.Id, S1.Name, S1.Email);
            Console.ReadKey();
        }
    }
}