namespace System.Threading { public static class LazyInitializer { public static T EnsureInitialized<T>(ref T target) where T : class; public static T EnsureInitialized<T>(ref T target, ref bool initialized, ref object syncLock); public static T EnsureInitialized<T>(ref T target, ref bool initialized, ref object syncLock, Func<T> valueFactory); public static T EnsureInitialized<T>(ref T target, Func<T> valueFactory) where T : class; } }