Error using Using [duplicate]

Question

I have an error

Type used in a using statement must be implicitly convertible to 'System.IDisposable'

on line

using (var context = new EntityContainer())

Here is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
using System.Globalization;
using System.Data;
using System.Data.Entity;
using school.usi.susibar.model;

namespace school.usi.susibar.test
{
    class Program
    {

        public static void Main(string []args)
         {
            using (var context = new EntityContainer())
            {

                addOrderStatusType(context);

                Console.ReadLine();
            }
        } 


        private static void addOrderStatusType(EntityContainer context)
        {
            try
            {
                OrderStatusType type = new OrderStatusType
                {
                    Name = "Vyrizeno", 
                    CancelPermission = false, 
                    ChangePermission = false
                };
                context.OrderStatusTypes.Add(type);
                context.SaveChanges();
                Console.WriteLine("Pridano");
            }
            catch (Exception ex) {
                Console.WriteLine(ex.InnerException);
            }
        }
         }

            }

The EntityContainer() looks like this...

//------------------------------------------------------------------------------
// <auto-generated>
//    This code was generated from a template.
//
//    Manual changes to this file may cause unexpected behavior in your application.
//    Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace school.usi.susibar.model
{
    using System;
    using System.Data.Entity;
    using System.Data.Entity.Infrastructure;

    public partial class EntityContainer : DbContext
    {
        public EntityContainer()
            : base("name=EntityContainer")
        {
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            throw new UnintentionalCodeFirstException();
        }

        public DbSet<Role> Roles { get; set; }
        public DbSet<Category> Categories { get; set; }
        public DbSet<Table> Tables { get; set; }
        public DbSet<OrderStatusType> OrderStatusTypes { get; set; }
        public DbSet<Person> Persones { get; set; }
        public DbSet<Item> Items { get; set; }
        public DbSet<Order> Orders { get; set; }
        public DbSet<Stock> Stocks { get; set; }
        public DbSet<ItemOrderList> ItemOrderLists { get; set; }
        public DbSet<ItemOrderStatus> ItemOrderStatuses { get; set; }
        public DbSet<PaymentOrderStatus> PaymentOrderStatuses { get; set; }
        public DbSet<Prepaid> Prepaids { get; set; }
    }
}

EDIT: DbContext implements IDisposable and I cant edit EntityContainer() class since its generated from a template.

Any ideas what is wrong?

Answer 1

From this answer:

The context still implements IDisposable, but if you're getting an error... complaining about not implementing IDisposable, then your problem is most likely that your model is defined in a separate assembly that references EF5 and you have not added an EF5 reference to your project.