Differences Between Singleton Vs Static Classes In C#

Singleton and static classes are both C# design patterns for implementing specific functionality in a software application. However, they differ significantly in terms of their purpose, implementation, and application.


  • The Singleton pattern guarantees that a class has only one instance while providing a global access point to this instance.
  • When a single instance of a class must be shared across the entire application, a singleton class is used.
  • A Singleton class is instantiated using a private constructor and a static instance property. The instance property is used to access the single instance of the class.


public sealed class Singleton {
    private static Singleton instance = null;
    private static readonly object padlock = new object();
    Singleton() {}
    public static Singleton Instance {
        get {
            lock(padlock) {
                if (instance == null) {
                    instance = new Singleton();
                return instance;

Static Classes

A static class is one that only has static members and cannot be instantiated.

Static classes are used when a class is only required to provide a collection of utility or helper methods and no instances of the class are required.


public static class Utilities {
    public static int Add(int a, int b) {
        return a + b;
    public static int Subtract(int a, int b) {
        return a - b;

To summarise, the Singleton pattern ensures that a class has only one instance and provides a global point of access to it, whereas the static class is used to create utility classes that only have static members.

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