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copied!<p>I think, if you want a thread safety, you should use this way:</p> <pre><code>internal sealed class SektionCache : CacheBase { //public static readonly SektionCache Instance = new SektionCache(); // this template is better ( safer ) than the previous one, for thread-safe singleton patter >>> private static SektionCache defaultInstance; private static object readonly lockObject = new object(); public static SektionCach Default { get { SektionCach result = defaultInstance; if ( null == result ) { lock( lockObject ) { if ( null == result ) { defaultInstance = result = new SektionCache(); } } } return result; } } // <<< this template is better ( safer ) than the previous one //private static readonly object lockObject = new object(); //private static bool isUpdating; //private IEnumerable<Sektion> sektioner; // this declaration is enough private volatile IEnumerable<Sektion> sektioner; // no static constructor is required >>> //static SektionCache() //{ // UpdateCache(); //} // <<< no static constructor is required // I think, you can use getter and setter for reading & changing a collection public IEnumerable<Sektion> Sektioner { get { IEnumerable<Sektion> result = this.sektioner; // i don't know, if you need this functionality >>> // if ( null == result ) { result = new Sektion[0]; } // <<< i don't know, if you need this functionality return result; } set { this.sektion = value; } } //public static void UpdateCache() //{ //// SNIP - getting data, locking etc. //Instance.sektioner = newSektioner; //// SNIP //} } </code></pre>

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