usingtest

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

namespace UsingTest
{
   public class Program
    {
        static void Main(string[] args)
        {
            //Compiler error - "type used in a using statement must be implicitly convertible to 'System.IDisposable'".
            using (Customer objCustomer = new Customer("Kevin"))
            {
                Console.WriteLine(objCustomer.ToString());
                Console.ReadKey();
            }

            using (Student objStudent = new Student("Kevin"))
            {
                Console.WriteLine(objStudent.ToString());
                Console.ReadKey();
            }
        }
    }

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

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

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

   public class Student :IDisposable
   {
       public string Name { get; set; }

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

       public override string ToString()
       {
           return Name;
       }

       void Dispose()
       {
           throw new NotImplementedException();
       }
   }
}