When developing apps with C# in the .NET framework, you have a choice between two single, shared class instances. Whether you decide to use a static keyword or a singleton design pattern depends on several factors, which are outlined in the article below.          

Key Differences Between Static Classes and Singleton Patterns

Put simply, a singleton is a pattern while a static class is a keyword. This means you can create one, persistent instance across an application’s entire lifespan with a singleton. The nifty thing about singletons is that a single instance can be used as a parameter for other methods. On the other hand, static classes only permit static methods and can’t be passed as parameters.