C# Links

Periodic Execution in .NET: This is the best implementation note I found of the common pattern to run tasks periodically. TLDR version: use the ThreadPool.RegisterWaitForSingleObject() function.

Implementing the Singleton Pattern in C#: I actually found singleton not all that useful. The article is a good discussion of many C# features nonetheless. TLDR version:

None lazy version code snippet:

public sealed class Singleton
{
    private static readonly Singleton instance = new Singleton();

    // Explicit static constructor to tell C# compiler
    // not to mark type as beforefieldinit
    static Singleton() {}

    private Singleton() {}

    public static Singleton Instance {get {return instance;}}
}

Lazy version code snippet: (requiring .NET 4 or above)

public sealed class Singleton
{
    private static readonly Lazy<Singleton>
    lazy = new Lazy<Singleton> (() => new Singleton());
    
    public static Singleton Instance { get { return lazy.Value; } }

    private Singleton() {}
}