Singleton Design Pattern in C# - Do it THAT way

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So, what is C#?
C# (pronounced "See Sharp") is a modern, object-oriented, and type-safe programming language. C# enables developers to build many types of secure and robust applications that run in .NET. C# has its roots in the C family of languages and will be immediately familiar to C, C++, Java, and JavaScript programmers. This tour provides an overview of the major components of the language in C# 8 and earlier. If you want to explore the language through interactive examples, try the introduction to C# tutorials.
And what about Singletons?
In software engineering, the singleton pattern is a software design pattern that restricts the instantiation of a class to a singular instance. One of the well-known "Gang of Four" design patterns, which describe how to solve recurring problems in object-oriented software, the pattern is useful when exactly one object is needed to coordinate actions across a system.
More specifically, the singleton pattern allows objects to:
Ensure they only have one instance
Provide easy access to that instance
Control their instantiation (for example, hiding the constructors of a class)
To learn more, make sure to watch the video, and we promise you that you'll become a C# developer in no time! Have fun!
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[@tutorialsEUC]

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[@superkfc5410]

This is the best Singleton tutorial i've come across. Great stuff!

[@rodolfoa.calvojaubert9953]

Nice tut, but I must say that it does not explain when and why I should use such pattern, I think it would nice to have something like that but more orientated to a real scenarios because this is too simple

[@Special_221]

Excellent demonstration

[@mateociotti3564]

Helped a lot, thanks

[@777grw]

Simple and precise

[@abyandev8571]

easy to follow. Best Tutorial ❤

[@tutorialsEUC]

Glad you think so!

[@sefatergbashi]

Thank you!

[@rktmimob]

explained very easy way 😊

[@saecula2391]

sehr schön erklärt @ 08:42 .. lock gab es auch schon in delphi 5, eine sehr nützliche Funktion um gleichzeitige threads doch noch unter Kontrolle zu bringen *g

[@FranciscoAlvino]

Nice! Great job 👏🏻👏🏻👏🏻

[@tutorialsEUC]

Thanks! 😊

[@NivedyaSusil]

Thanks !
Pls do videos on other design patterns as well

[@MarinaMarina-fr8ex]

This is great tutorial. Can you please add more videos for other design patterns like strategy, observer, facade etc?

[@iamnoob7593]

Superb

[@user-dt1cv6hs2g]

good one

[@sumitvishwakarma56]

What if we have a distributed environment , multiple instance of this service would be running, how do we prevent multiple instances then?

[@jhonnidarshan3094]

Nice tutorial

[@tutorialsEUC]

Thank you! Cheers!

[@rhtservicestech]

Wouldn't it make more sense to remove the outer check for the null instance? I say that because you now have the same condition duplicated in your code which isn't ideal or efficient.

[@alieninoy5654]

If the outer check is removed, the application will acquire a lock every time the instance is requested, impacting performance.

[@JohnEBoldt]

How about this approach?
namespace SingletonConsole
{
public sealed class UploadService
{
private static UploadService _uploadService;
private UploadService() { }
static UploadService()
{
_uploadService = new UploadService();
}
public static UploadService Instance()
{
return _uploadService;
}
}
}
Static constructors in C# are thread safe, so this will guarantee that _uploadService is initiated only the first time UploadService is referenced.

[@jaycorrales5329]

@8:40 is the critical section of this video thread.

[@jithumuraleedharan5231]

❤

[@Matthew-sy4lj]

Hi there very interesting tutorial.
Unfortunately though I'm receiving two errors:
1. Program does not contain a static 'Main' method suitable for an entry point (CS5001)
2. When I try to pass values from my instance threads it says that UploadService is inaccessible due to the protect level of my class being sealed/private.
I'm new to programming so I'm a bit lost at the moment as I had to create a new project/program to link it with the UploadService class. What should I do?

[@tutorialsEUC]

Hi, awesome that you try it out!
Make sure that your program cotains a "static void Main" and that you create a "public class UploadService". Also set your program class itself to "public".
Greets :)

[@andreysemykin5879]

Instead of manually managing a lifetime for a service, using static etc it should be done via DI container and in the real world nobody does it the way in the video.