In the coming months I’ll be covering the new features of .NET 6, including things like MAUI (Cross platform GUI in .NET), PriorityQueue, and so much more. So I thought it would be worth talking a little bit on how to actually get set up to use .NET 6 if you are looking to touch this new tech early on.

In previous versions of .NET/.NET Core, the process to accessing preview versions was somewhat convoluted and involved installing a second “preview” version of Visual Studio to get up and running, but all that’s out the window now and things are easier than ever!

Setting Up .NET 6 SDK

To start, head over to the .NET 6 download page and download the latest SDK (not runtime!) for your operating system :

After installing, from a command prompt, you should be able to run “dotnet –info” and see something similar to the below :

.NET SDK (reflecting any global.json):
 Version:   6.0.100-preview.2.21155.3
 Commit:    1a9103db2d

It is important to note that this is essentially telling you that the default version of the .NET SDK is .NET 6 (Although, sometimes in Visual Studio, it will ignore preview versions as we will shortly see). This is important to note because any projects that don’t utilize a global.json will now be using .NET 6 (and a preview version at that). We have a short guide on how global.json can determine which SDK is used right here.

Setting Up Visual Studio For .NET 6

Now for the most part, developers of .NET will use Visual Studio. And the number one issue I find when people say “the latest version of .NET does not work in Visual Studio”, is because they haven’t downloaded the latest updates. I don’t care if a guide says “You only need version X.Y.Z” and you already have that. Obviously you need Visual Studio 2019, but no matter what anyone tells you about required versions, just be on the latest version.

You can check this by going to Help, then Check For Updates inside Visual Studio. The very latest version at the time of writing is 16.9.1, but again, download whatever version is available to you until it tells you you are up to date.

After installing the latest update, there is still one more feature flag to check. Go Tools -> Options, then select Preview Features as per the screenshot below. Make sure to tick the “Use previews of the .NET Core SDK”. Without this, Visual Studio will use the latest version of the .NET SDK installed, that is *not* a preview version. Obviously once .NET 6 is out of preview, you won’t need to do this, but if you are trying to play with the latest and greatest you will need this feature ticked.

After setting this, make sure to restart Visual Studio manually as it does not automatically do it for you. And you don’t want to be on the receiving end of your tech lead asking if you have “turned it off and on again” do you!

Migrating A Project To .NET 6

For the most part, Visual Studio will likely not create projects in .NET 6 by default when creating simple applications like console applications. This seems to vary but.. It certainly doesn’t for me. But that’s fine, all we have to do is edit our csproj file and change our target framework to net6.0 like so :


If you build and you get the following :

The current .NET SDK does not support targeting .NET 6.0.  Either target .NET 5.0 or lower, or use a version of the .NET SDK that supports .NET 6.0

The first thing to check is

  1. Do you have the correct .NET 6 SDK installed. If not, install it.
  2. Is .NET 6 still in preview? Then make sure you have the latest version of Visual Studio *and* have the “Use previews of the .NET Core SDK” option ticked as per above.

And that’s it! You’re now all set up to use the juicy goodness of .NET 6, and all those early access features in preview versions you’ve been waiting for!

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It feels like just last month .NET 6 Preview 1 was released…. In fact it was! Such is the cadence of releases with .NET now, they are getting pumped out at blazing speed. It means that each release only has marginal improvements each time, but it also means that you can grab the preview versions and actually start playing with features (and providing feedback) at a pretty crazy pace.

You can grab .NET 6 Preview 2 here :

Now as for what’s new, in short :

  • A key focus of .NET 6 is improving the developer experience by way of speeding up the feedback process of the tools you use every day. In Preview 2, that means showing off vastly improved build times across a range of projects (MVC and Blazor), in some cases cutting the build time by over half! If you are someone like me that runs a project using “dotnet watch”, then it’s great to see improvements in this area.
  • Further improvements to .NET Multi-platform App UI (Or MAUI for short), which means single project developer experiences not only across mobile platforms like Android and IOS, but even Mac OS too!
  • System.Text.Json now has a feature to “IgnoreCycles” which acts similar to the Newtonsoft.Json.ReferenceLoopHandling. This may sound like a small feature, but it’s actually been highly requested for a very long time now! For more information on what this fixes, we have a great article on it here :
  • Implementation of “PriorityQueue”. This is massive and a much needed enhancement! It allows developers to create a queue, but give each item in that queue a priority. On Dequeue, items with the highest priority are popped first. This will replace a tonne of custom coded “Queues” that are really un-performant lists in the background!

The full release notes as always is here :

Overall, those same minor improvements we’ve come to expect each release. But for me, the addition of the PriorityQueue is really great to see. Expect a blog post coming your way soon on the topic!

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It feels like not long ago we were talking about all the goodies in .NET 5, and here we are already jumping into .NET 6. It actually made me go back and look at the .NET Framework versions on Wikipedia here. Admittedly back then, minor versions of the framework sometimes contained huge changes. For example async/await was added in version 4.5, which these days would suggest a “minor” update, but obviously was pretty huge. But even still, version 1.0 to version 4.8 was 17 years in the making.

The first version of .NET Core was released in 2016, and here we are in 2021, just 5 years later, and we are already up to seeing preview versions of .NET Core 6. It really speaks to not only Microsoft’s commit to move fast, but I think just the overall cadence of modern software development. Gone are the days of developers sitting in cubicles and sitting on work for three years until a a major release.

You can grab .NET 6 Preview 1 here :

As for what’s new. Well generally the first preview release of a new .NET Version is typically setting the stage for what’s to come and doesn’t necessarily contain a lot of “toys” to play with. With that being said, some of the features that did make it in were :

  • The first iteration of moving Xamarin into .NET to unify the platforms. e.g. Being able to build Android/IOS applications in .NET.
  • A first crack at using Blazor for desktop applications (From early reading, this seems very close to how you might use Electron, e.g. It’s still a web control view on desktop).
  • There seems to be talk about better hot reload functionality. I can’t find that much information on this. The .NET CLI already has “dotnet watch“, but this is more of a complete build rather than a nice iterative hot reload.
  • Improvement to Single File Apps so that they actually execute from that single file rather than extracting into temp directories. This was already the case for single file applications for Linux in .NET 5, but in .NET 6, this functionality has been extended for Windows and Mac.
  • There is no appsettings.json auto complete for commonly used configuration such as logging, host filtering, kestrel setup etc.
  • WPF is now supported on ARM64.

The full release as always is here :

Overall, probably not a heck of a lot if you are a web developer. One of the major themes of .NET 6 (And even .NET 5), is unifying the various platforms and frameworks that sit under the .NET banner. In .NET 5, it was mostly desktop development, and in .NET 6, it’s a lot of mobile development with Xamarin. It doesn’t mean there won’t be something in future preview versions of course, but for now, get excited about mobile dev!

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With the announcement of .NET 5 last year, and subsequent announcements leading up to MSBuild 2020, a big question has been what’s going to happen to “.NET Standard”. That sort of framework that’s not an actual framework just an interface that various platforms/frameworks are required to implement, but not really, and then you have to get David Fowler to do a Github Gist that gets shared a million times to actually explain to people what the hell this thing is.

Anyway. .NET Standard is no more (Or will be eventually). As confusing as it may be at first to get rid of something that was only created 3 odd years ago… It does kinda make sense to get rid of it at this juncture.

Rewinding The “Why” We Even Had .NET Standard

Let’s take a step back and look at how and why .NET Standard came to be.

When .NET Core was first released, there was a conundrum. We have all these libraries that are already written for .NET Framework, do we really want to re-write them all for .NET Core? Given that the majority of early .NET Core was actually a port of .NET Framework to work cross platform, many of the classes and method signatures were identical (Infact I would go as far as to say most of them were).

Let’s use an example. Let’s say that I want to open a File inside my library using the standard File.ReadAllLines(string path) call. Now it just so happens if you write this code in .NET Framework, .NET Core or even Mono, it takes the same parameters (a string path variable), and returns the same thing, (a string array). Now *how* these calls read a file is up to the individual platform (For example .NET Core and Mono may have some special code to handle Mac path files), but the result should always be the same, a string array of lines from the file.

So if I had a library that does nothing but open a file to read lines and return it. Should I really need to release that library multiple times for different frameworks? Well, that’s where .NET Standard comes in. The simplest way to think about it is it defines a list of classes and methods that every platform agrees to implement. So if File.ReadAllLines() is part of the standard, then I can be assured that my library can be released once as a .NET Standard library, and it will work on multiple platforms.

If you’re looking for a longer explanation about .NET Standard, then there’s an article I wrote over 3 years ago that is still relevant today :

TL;DR; .NET Standard provided a way for different .NET Platforms to share a set of common method signatures that afforded library creators to write code once and be able to run on multiple platforms. 

.NET Standard Is No Longer Needed

So we come to the present day where announcements are coming out that .NET Standard is no longer relevant (sort of). And there’s two main reasons for that….

.NET Core Functionality Surpassed .NET Framework – Meaning New .NET Standard Versions Were Hard To Come By

Initially, .NET Core was a subset of .NET Framework functionality. So the .NET Standard was a way almost of saying, if you wrote a library for .NET Framework, here’s how you know it will work out of the box for .NET Core. Yes, .NET Standard was also used as a way to see functionality across other platforms like Mono, Xamarin, Silverlight, and even Windows Phone. But I feel like the majority of use cases were for .NET Framework => .NET Core comparisons.

As .NET Core built up it’s functionality, it was still essentially trying to reach feature parity with .NET Framework. So as a new version of .NET Core got released each year, a new version of .NET Standard also got released with it that was, again, almost exclusively to look at the common method signatures across .NET Framework <=> .NET Core. So eventually .NET Core surpasses .NET Framework, or at the very least says “We aren’t porting anything extra over”. This point is essentially .NET Standard 2.0.

But obviously work on .NET Core doesn’t stop, and new features are added to .NET Core that don’t exist in .NET Framework. But .NET Framework updates at first are few and far between,  until it’s announced that essentially it’s maintenance mode only (Or some variation there-of). So with the new features being added to .NET Core, do they make sense to be added to a new version of standard given that .NET Framework will never actually implement that standard? Kind of.. .Or atleast they tried. .NET Standard 2.1 was the latest release of the standard and (supposedly, although some would disagree), is implemented by both Mono and Xamarin, but not .NET Framework.

So now we have a standard that was devised to describe the parity between two big platforms, that one platform is no longer going to be participating in. I mean I guess we can keep implementing new standards but if there is only one big player actually adhering to that standard (And infact, probably defining it), then it’s kinda moot.

The Merger Of .NET Platforms Makes A Standard Double Moot

But then of course we rolled around 6 months after the release of .NET Standard 2.1,  and find the news that .NET Framework and .NET Core are being rolled into this single .NET platform called .NET 5. Now we are doubly not needing a standard because the two platforms we were trying to define the parity are actually just going to become one and the same.

Now take that, and add in the fact that .NET 6 is going to include the rolling in of the Xamarin platform. Now all those charts you saw of .NET Standard where you tried to trace your finger along the columns to check which version you should support are moot because there’s only one row now, that of .NET 6.

In the future there is only one .NET platform. There is no Xamarin, no .NET Core, no Mono, no .NET Framework. Just .NET.

So I Should Stop Using .NET Standard?

This was something that got asked of me recently. If it’s all becoming one platform, do we just start writing libraries for .NET 5 going forward then? The answer is no. .NET Standard will still exist as a way to write libraries that run in .NET Framework or older versions of .NET Core. Even today, when picking a .NET Standard version for a library, you try and pick the lowest number you can feasibly go to ensure you support as many platforms as you can. That won’t change going forward – .NET 5 still implements .NET Standard 1.0 for example, so any library that is targeting an older standard still runs on the latest version of the .NET platform.

What will change for the better are those hideously complex charts and nuget dependency descriptions on what platforms can run a particular library/package. In a few years from now it won’t be “Oh this library is for .NET Standard 2.1, Is that for .NET Core 2.1? No, it’s for .NET Core 3+… Who could have known”. Instead it will be, oh this library is for .NET 5, then it will work in .NET 7 no problems.

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So by now you’ve probably heard a little about various .NET 5 announcements and you’re ready to give it a try! I thought first I would give some of the cliffnotes from the .NET 5 announcement, and then jump into how to actually have a play with the preview version of .NET 5 (Correct as of writing this post on 2020-05-22).

Cliff Notes

  • .NET Standard is no more! Because .NET Framework and .NET Core are being merged, there is less of a need for .NET Standard. .NET Standard also covers things like Xamarin but that’s being rolled into .NET 6 (More on that a little later), so again, no need for it.
  • .NET Core coincides with C#9 and F#5 releases (As it typically does), but Powershell will now also be released on the same cadence.
  • They have added a visual designer for building WinForm applications since you could theoretically build WinForm applications in .NET Core 3.X but not design them with quite as much functionality as you typically would.
  • .NET 5 now runs on Windows ARM64.
  • While the concept of Single File Publish already exists in .NET Core 3.X, it looks like there has been improvements where it’s actually a true exe instead of a self extracting ZIP. Mostly for reasons around being on read-only media (e.g. A locked down user may not be able to extract that single exe to their temp folder etc).
  • More features have been added to System.Text.Json for feature parity with Newtonsoft.Json.
  • As mentioned earlier, Xamarin will be integrated with .NET 6 so that there would be a single unifying framework. Also looks like Microsoft will be doing a big push around the .NET ecosystem as a way to build apps once (in Xamarin), and deploy to Windows, Mac, IOS, Android etc. Not sure how likely this actually is but it looks like it’s the end goal.

Setting Up The .NET 5 SDK

So as always, the first thing you need to do is head to the .NET SDK Download page here : Note that if you go to the actual regular download page of you are only given the option to download .NET Core 3.1 or .NET Framework 4.8 (But there is a tiny little banner above saying where you can download the preview).

Anyway, download the .NET 5 SDK installer for your OS.

After installing, you can run the dotnet info command from a command prompt :

dotnet --info

Make sure that you do have the SDK installed correctly. If you don’t see .NET 5 in the list, the most common reason I’ve found is people installing the X86 version on their X64 PC. So make sure you get the correct installer!

Now if you use VS Code, you are all set. For any existing project you have that you want to test out running in .NET 5 (For example a small console app), then all you need to do is open the .csproj file and change :


To :


As noted in the cliffnotes above, because there is really only one Framework with no standard going forward, they ditched the whole “netcoreapp” thing and just went with “net”. That means if you want to update any of your .NET Standard libraries, you actually need them to target “net5.0” as well. But hold fire because there is actually no reason to bump the version of a library unless you really need something in .NET 5 (Pretty unlikely!).

.NET 5 In Visual Studio

Now if you’ve updated your .NET Core 3.1 app to .NET 5 and try and build in Visual Studio, you may just get :

The reference assemblies for .NETFramework,Version=v5.0 were not found. 

Not great! But all we need to do is update to the latest version and away we go. It’s somewhat lucky that there isn’t a Visual Studio release this year (e.g. There is no Visual Studio 2020), otherwise we would have to download yet another version of VS. So to update, inside Visual Studio, simply go Help -> Check For Updates. The version you want to atleast be on is 16.6 which as of right now, is the latest non-preview version.

Now after installing this update for the first time, for the life of me I couldn’t work out why I could build an existing .NET 5 project, but when I went to create a new project, I didn’t have the option of creating it as .NET 5.

As it turns out, by default the non-preview version of Visual Studio can only see non-preview versions of the SDK. I guess so that you can keep the preview stuff all together. If you are like me and just want to start playing without having to install the Preview version of VS, then you need to go Tools -> Options inside Visual Studio. Then inside the options window under Environment there is an option for “Preview Features”.

Tick this. Restart Visual Studio. And you are away laughing!

Do note that some templates such as Console Applications don’t actually prompt you for the SDK version when creating a new project, they just use the latest SDK available. In this case, your “default” for Visual Studio suddenly becomes a preview .NET Core SDK. Perfectly fine if you’re ready to sit on the edge, but just something to note in case this is a work machine or similar.


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It’s here! .NET Core 3.0 has been released! You can read the full release post from Microsoft here :

Since early preview versions of .NET Core 3, I’ve been blogging about various features that have been making their way in. So here’s a quick run down on what you can finally use in the “current” release of .NET Core.

Nullable reference types support – Allows you to specify reference types not be nullable by default
Default interface implementations support – Allows you to write an interface implementation in the interface itself
Async streams/IAsyncEnumerable support – True async list streaming
.NET Core now supports desktop development – Take your Winform/WPF apps and build them on .NET Core
Index structs – More declarative approach to reference an index in an array
Range type – Better syntax for “splicing” an array
Switch expressions – Cleaner syntax for switch arrays that return a result
Single EXE Builds – Package an entire application into a single exe file
IL Linker Support – Trim unneeded packages from self contained deploys

And of course things I haven’t blogged about but are still amazing features include the new JSONWriter/Reader, better Docker support, a new SQLClient, HTTP/2 Support, and of course a heap of performance improvements. I’ll say it again, head over to the official release post and have a look :

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.NET Core 3.0 Preview 7 has been released as of July 23rd. You can grab it here :

What’s Included

The official post from Microsoft is here : but you’re not going to find anything shiny and new to play with. Infact the post explicitly states “The .NET Core 3.0 release is coming close to completion, and the team is solely focused on stability and reliability now that we’re no longer building new features“. So if something hasn’t made it into .NET Core 3.0 by now, you might be waiting until 3.1.

But that doesn’t mean we can’t take a look at what’s been happening under the hood. So I took a look at the Github issue list to see what did make it to this release, even if it wasn’t worth a shout out in the official blog post. In particular, there seems to be two main areas that has garnered quite a few taggings.

JsonSerializer Bugs

Unsurprisingly with .NET Core moving away from JSON.NET and instead moving to use their own JSON Serializer, there has been bugs a plenty. At a glance, it mostly looks like edgecase stuff where in particular scenarios, serializing and deserializing is not working as expected. Things like JSON Should be able to handle scientific notation.

Blazor Bugs

Blazor has been getting a major push recently – I’m seeing it show up more and more in my twitter feed. And along with people using it for realworld work loads, comes people logging bugs. To be brutally honest, I haven’t used Blazor at all. It feels like it’s trying to solve a problem that doesn’t exist somewhat like the early days of ASP.NET WebForms. (And feel free to drop a comment below about how I’m totally wrong on that!).

Worth Updating?

One thing worth mentioning is that Microsoft say “NET Core 3.0 Preview 7 is supported by Microsoft and can be used in production“. So they obviously feel confident enough that this is a proper Release Candidate. But in terms of getting this because there is something new in there that you definitely need to get a hold of, it’s probably worth skipping for now.

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.NET Core 3.0 Preview 6 has been released as of June 12th. You can grab it here :

What’s Included

The official blog post from Microsoft is here : . But of course if you want the cliff notes then…

Docker Images For ARM64

Previously docker images for .NET Core were only available for X64 systems, however you can now grab ’em for ARM64 too!

Ready To Run Images

Probably the most interesting thing contained in this release is the “Ready To Run” compilation ability. If you’ve ever used NGEN in previous versions of the .NET Framework, or attempted to some ahead of time jitting to improve your applications startup performance, then this is for you.

Better Assembly Linking

It’s always been possible to publish self contained applications in .NET Core that don’t require the runtime to be present on the destination machine. Unfortunately this sometimes made self contained apps (even one’s that did nothing but print Hello World!) become massive. Preview 6 contains a way to trim the required assemblies to reduce the footprint by almost half.

HTTP/2 Support In HTTPClient

HTTP/2 support has reached .NET Core! The default is still HTTP/1.1, but you are now able to opt in to create connections using a specific version. HTTP/2 opens up the world of multiplexed streams, header compression and better pipelining.

Worth Updating?

Probably the biggest thing for most developers in this version is HTTP/2 support. It’s likely something that will become defacto in the future so if you want to get ahead of the curve, get stuck in!

Ready To Run images are also pretty huge. If you remember that famous blog post from the Bing team around performance improvements they gained from switching to .NET Core 2.1 (, a big factor was ahead of time compiling of the code. So it’s definitely going to change the game for a lot of companies running .NET Core code.

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I’m calling it now, 2019 is going to be the year of action! .NET Core Tutorials has been running strong for over 2 years now (We were there right from the project.json days). Back then, people were fine reading all about the latest features of .NET Core. But these days, people want to be shown. Live! That’s why I’m starting live coding sessions on every Wednesday and Sunday. I’ll be covering a variety of topics, but you’ll often catch me doing live blog writing sessions where you can get a sneak peak of content before it goes live and ask any questions while I’m doing live coding. We’ve already had some great questions in chat while doing our post on C# 8 IAsyncEnumerable.

So get amongst it. Head on over, drop a follow, and tune in next time!

But enough about me, I want it to be a year of action for you too. That’s why I’m giving away a copy of *any* of Manning’s classic “In Action” books. You know, those ones with the ye olde covers. Like this Core In Action book by Andrew Lock (Who is a great author by the way!).

I bold the word *any* above because it’s not just Core In Action, but actually any “In Action” book you want. Want to learn Redux in 2019? Try Redux In Action. Want to learn all about Amazon Web Services? Try AWS In Action. How about learning a bit of data science in R? Well… You guessed it, try R In Action. Infact just head over to Amazon and check out any of the In Action titles and start drooling over which one you want if you win!

Use any of the entry options below (or multiple), and you are in to win! It’s that easy!

Enter Now

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At Microsoft Build today, it was announced that a Windows Desktop “pack” or “addon” would be released for .NET Core. It’s important to note that this is a sort of bolt on to .NET Core and actually won’t be part of .NET Core itself. It’s also important to note that this will not make Desktop Applications cross platform. It’s intended that the desktop apps built on top of .NET Core are still Windows only as they have always been (This is usually due to the various drawing libraries of the operating systems).

So you may ask yourself what’s the point? Well..

  • .NET Core has made huge performance improvements for everyday structs and classes within the framework. For example Dictionaries, Enums and Boxing operations are all now much faster on .NET Core 2.1
  • .NET Core comes with it’s own CLI and tooling improvements that you may prefer over the bloated .NET Framework style. For example a much cleaner .csproj experience.
  • Easy to test different .NET Core runtimes on a single machine due to how .NET Core allows multiple runtimes on a single machine.
  • You can bundle .NET Core with your desktop application so the target machine doesn’t require a runtime already. You can bundle .NET Framework with desktop applications, but it basically just does a quick install beforehand.

I think most of all is going to be the speed of .NET Core releases. At this point .NET Core is creating releases at a breakneck speed while the next minor release of the .NET Framework (4.7.2 -> 4.8) is expected to ship in about 12 months. That’s a very slow release schedule compared to Core. While Core doesn’t have too many additional features that .NET Framework doesn’t have, it likely will start drifting apart in feature parity before too long. That’s slightly a taboo subject at times, and it’s actually come up before when Microsoft wanted to discontinue support for running Core applications on full framework. Microsoft did cave to pressure that time around, but it’s simply undeniable that Core is moving at a faster pace than the full Framework right now.

You can read the official announcement on the MSDN Blog here :

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