using System;  

namespace PerformanceLibrary
{
    public class  TypeA :IDisposable
    {
        // Assume this type has some unmanaged resources.
        private bool disposed = false;

        protected virtual void Dispose(bool disposing) 
        {
            if (!disposed) 
            {
                // Dispose of resources held by this instance.
                // (This process is not shown here.)

                // Set the sentinel.
                disposed = true;
   
                // Suppress finalization of this disposed instance.
                if (disposing)
                {
                    GC.SuppressFinalize(this);
                }
            }
        }

        public void Dispose()
        {
            Dispose(true);
        }

        // Disposable types implement a finalizer.
        ~TypeA()
        {
            Dispose(false);
        }
    }
}