foreach loop test in C#

foreachtest

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ForeachTest
{
   public class Program
    {
        static void Main(string[] args)
        {
            List<int> lstValues = new List<int> { 1, 2, 3, 4, 5 };

            foreach (int value in lstValues)
            {
                value = 2;//Compiler error, cannot assign to foreach iteration variable.
            }

            List<Customer> lstCustomer = new List<Customer>
            {
                new Customer("Steve"),
                new Customer("Kevin"),
                new Customer("Cook"),
                new Customer("Finn"),
            };
            
            foreach (Customer objCustomer in lstCustomer)
            {
                Console.WriteLine(objCustomer.ToString()); 
                objCustomer.Name = "Rohit"; //This is ok, objects is mutable.
                objCustomer = null;//Compiler error, "cannot assign to foreach iteration variable."
                lstCustomer.Remove(objCustomer);//Runtime exception, "Collection was modified; enumeration operation may not execute."
            }
            Console.ReadKey();
        }
    }

   public class Customer
   {
       public string Name { get; set; }

       public Customer(string name)
       {
           this.Name = name;
       }

       public override string ToString()
       {
           return Name;
       }
   }
}