Example of thread-static context in .Net

gistfile1.cs

using System;

namespace AsyncScope
{
    public class MyContext : IDisposable
    {
        [ThreadStatic] private static MyContext CurrentContext;

        private readonly int value;
        private MyContext parentContext;

        public MyContext(int value)
        {
            this.value = value;

            parentContext = CurrentContext;
            CurrentContext = this;
        }

        public static int? Current
        {
            get
            {
                MyContext currentContext = CurrentContext;

                return currentContext != null ? currentContext.value : (int?) null;
            }
        }

        #region IDisposable Members

        void IDisposable.Dispose()
        {
            CurrentContext = parentContext;
            parentContext = null;
        }

        #endregion

        internal static void Clear()
        {
            CurrentContext = null;
        }
    }
}