How to implement a singleton in C#?

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If you are just storing some global values and have some methods that don’t need state, you don’t need singleton. Just make the class and its properties/methods static.

public static class GlobalSomething
{
   public static int NumberOfSomething { get; set; }

   public static string MangleString( string someValue )
   {
   }
}

Singleton is most useful when you have a normal class with state, but you only want one of them. The links that others have provided should be useful in exploring the Singleton pattern.

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