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What is Singleton Pattern in C#?
The Singleton pattern is a design pattern that restricts the instantiation of a class to one object and provides a way to access its object. This is useful when exactly one object is needed to coordinate actions across the system. That means we need to use the Singleton Design Pattern in C# to ensure that only one instance of a particular class will be created and provide simple global access to that instance for the entire application.

Implementation Guidelines of Singleton Design Pattern in C#:

The following are the guidelines to implement the Singleton Design Pattern in C#.

We need to declare a constructor that should be private and parameterless. This is required because it will restrict the class from being instantiated from outside the class. It only instantiates from within the class.
The class should be declared sealed, ensuring it cannot be inherited. This is going to be useful when you are dealing with the nested class.
We must create a private static variable referencing the class’s singleton instance.
We also need to create a public static property/method that will return the singleton instance of the class. This method or property first checks whether an instance of the singleton class is created. If the singleton instance is created, it returns that instance; otherwise, it will create an instance and then return it.


Example of Singleton Design Pattern using C#
Let us understand the Singleton Design pattern in C# with Examples. We can implement the Singleton Design Pattern in C# in many ways. They are as follows. We will discuss all the following methods to implement the Singleton Design Pattern in C#.

No Thread-Safe Singleton Design Pattern in C#
Thread-Safety Singleton Implementation using Lock.
Implementing Thread-Safety Singleton Design Pattern using Double-Check Locking.
Using Eager Loading to Implement Thread-Safety Singleton Design Pattern
Using Lazy T Generic Class to Implement Lazy Loading in Singleton Design Pattern.

What are the Advantages of using the Singleton Pattern in C#?
The Advantages of using the Singleton Design Pattern in C# are as follows.

The first and most important advantage of using the singleton design pattern in C# is that it takes care of concurrent access to the shared resource. That means if we share a resource with multiple clients simultaneously, then concurrent access to that resource is well managed by the singleton design pattern.
It can be lazy-loaded and also has Static Initialization.
To share common data, i.e., master and configuration data, which is not frequently changed in an application. In that case, we need to cache the objects in memory.
It is easy to maintain as it provides a single global access point to a particular instance.
To reduce the overhead of instantiating a heavy object again and again.
What are the Disadvantages of using the Singleton Design Pattern in C#?
The disadvantages of using the Singleton Design Pattern in C# are as follows:
Unit testing is very difficult because it introduces a global state into an application.
It reduces the potential for parallelism within a program because to access the singleton instance in a multi-threaded environment, and you need to serialize the object using locking.

When to Use Singleton Design Pattern in C#?
Here are situations where employing the Singleton pattern in C# might be appropriate:

Managing Shared Resources: Singleton is suitable for managing shared resources, such as:
A database connection pool.
A file manager that handles all file operations.
A cache where multiple parts of an application need to store and retrieve objects.
Configuration Settings: A Singleton can store and access configuration settings for an application-wide configuration object that needs to be accessed from multiple places.
Logging: A Singleton logger class can be used to log messages throughout the application. Since logging typically involves writing to a single resource (like a file or console), using a Singleton makes sense to avoid conflicts and ensure consistency.