---
title: "Difference between Static vs Singleton class in C#"  
description: "Difference between Static vs Singleton class in C#"  
author: "Ravi Vishwakarma"  
published: 2024-06-07  
updated: 2024-06-07  
canonical: https://www.mindstick.com/interview/33894/difference-between-static-vs-singleton-class-in-c-sharp  
category: "c#"  
tags: ["c#", ".net"]  
reading_time: 4 minutes  

---

# Difference between Static vs Singleton class in C#

In C#, both static training and singleton lessons are used to reap positive layout desires, but they serve exceptional functions.

## Static Classes:

1. **Purpose**: [Static classes](https://www.mindstick.com/blog/554/static-class-and-static-members-in-c-sharp) are used when you want to provide utility methods or a set of functionalities that are not tied to any specific instance of a class.
2. **Instance**: They can not be instantiated, and all their members have to be static.
3. **Usage**: Commonly used for developing utility capabilities, extension methods, helper training, or constants that do not exchange at some stage in the software's lifecycle.
4. **Thread Safety:** They are inherently thread-safe because their members are static and shared throughout all threads.

## Example:

```cs
public static class MathHelper
{
    public static double Add(double a, double b)
    {
        return a + b;
    }
}
```

\
**Singleton Classes:**

1. **Purpose**: [Singleton](https://www.mindstick.com/interview/23325/what-is-singleton-class-and-how-can-we-make-a-class-singleton) lessons are used when you want to ensure that the handiest example of a category exists in the course of the life of a software, offering worldwide entry to to that example.
2. **Instance**: They have an unmarried instance, typically accessed through a static asset or approach.
3. **Usage**: Often used for managing assets that must be shared across the application, along with configuration settings, database connections, or logging.
4. **Thread Safety:** Implementations need to recollect thread protection, especially in multi-threaded surroundings.

## Example:

```cs
public class Singleton
{
    private static Singleton _instance;
    private static readonly object _lock = new object();

    private Singleton() { }

    public static Singleton Instance
    {
        get
        {
            lock (_lock)
            {
                if (_instance == null)
                {
                    _instance = new Singleton();
                }
                return _instance;
            }
        }
    }
}
```

\
**Differences:**

1. Instance Creation: Static instructions cannot be instantiated, while singleton lessons have a mechanism to manipulate the instantiation of their unmarried instance.
2. Usage: Static classes are used for software functions or constant values, at the same time as singleton training is used whilst you need a single instance shared throughout the utility.
3. Thread Safety: Static lessons are inherently thread-secure, even as ensuring thread safety in singleton implementations is the duty of the developer.

In summary, pick out static lessons whilst you want utility features or constants, and pick out singleton classes whilst you want a single example of a class shared across the application. Ensure thread safety in singleton implementations, specifically in multi-threaded environments.

## Answers

### Answer by Ravi Vishwakarma

In C#, both static training and singleton lessons are used to reap positive layout desires, but they serve exceptional functions.

## Static Classes:

1. **Purpose**: [Static classes](https://www.mindstick.com/blog/554/static-class-and-static-members-in-c-sharp) are used when you want to provide utility methods or a set of functionalities that are not tied to any specific instance of a class.
2. **Instance**: They can not be instantiated, and all their members have to be static.
3. **Usage**: Commonly used for developing utility capabilities, extension methods, helper training, or constants that do not exchange at some stage in the software's lifecycle.
4. **Thread Safety:** They are inherently thread-safe because their members are static and shared throughout all threads.

## Example:

```cs
public static class MathHelper
{
    public static double Add(double a, double b)
    {
        return a + b;
    }
}
```

\
**Singleton Classes:**

1. **Purpose**: [Singleton](https://www.mindstick.com/interview/23325/what-is-singleton-class-and-how-can-we-make-a-class-singleton) lessons are used when you want to ensure that the handiest example of a category exists in the course of the life of a software, offering worldwide entry to to that example.
2. **Instance**: They have an unmarried instance, typically accessed through a static asset or approach.
3. **Usage**: Often used for managing assets that must be shared across the application, along with configuration settings, database connections, or logging.
4. **Thread Safety:** Implementations need to recollect thread protection, especially in multi-threaded surroundings.

## Example:

```cs
public class Singleton
{
    private static Singleton _instance;
    private static readonly object _lock = new object();

    private Singleton() { }

    public static Singleton Instance
    {
        get
        {
            lock (_lock)
            {
                if (_instance == null)
                {
                    _instance = new Singleton();
                }
                return _instance;
            }
        }
    }
}
```

\
**Differences:**

1. Instance Creation: Static instructions cannot be instantiated, while singleton lessons have a mechanism to manipulate the instantiation of their unmarried instance.
2. Usage: Static classes are used for software functions or constant values, at the same time as singleton training is used whilst you need a single instance shared throughout the utility.
3. Thread Safety: Static lessons are inherently thread-secure, even as ensuring thread safety in singleton implementations is the duty of the developer.

In summary, pick out static lessons whilst you want utility features or constants, and pick out singleton classes whilst you want a single example of a class shared across the application. Ensure thread safety in singleton implementations, specifically in multi-threaded environments.


---

Original Source: https://www.mindstick.com/interview/33894/difference-between-static-vs-singleton-class-in-c-sharp

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