gistfile1.cs

public class Lazy<T>
{
   private Func<T> factory;
   private object objectLock = new Object();
   private T lazyValue;

   public Lazy(Func<T> factory)
   {
      this.factory = factory;    
   }

   public bool IsValueCreated { get; private set; }

   public T Value 
   { 
      get 
      {
          lock(objectLock)
          {
             if(!IsValueCreated)
             {
                 lazyValue = factory();
                 IsValueCreated = true;
             }
          }
          return lazyValue;
      }
   }
}