When to use ValueTask instead of Task and save precious memory in C#

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Hello everybody I'm Nick and in this video I show you how you can use ValueTask instead of Task in your .NET code and save memory. I will talk about one of the most common usecases that pretty much everyone can benefit from and release pressure from the garbage collector and the heap.
Understanding the Whys, Whats, and Whens of ValueTask: devblogs.microsoft.com/dotnet...
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#dotnet #await #async

[@TedFanat]

Finally, I found someone who uses a youtube channel to "walk walks and not just talk talks". Really interesting and good explained

[@fr3ddyfr3sh]

Damn, I’m doing C# for 10 years, and Nick knows his stuff. Short, to the point Videos, perfect for learning or bringing something back you knew once.

[@aliascross]

Happy Birthday Nick 😁👍

[@bilbobaggins601]

Another banger of a video! Im still a beginner to C#, but i always watch your videos because they are instructional and interesting. One question, im not sure if you did it already but can you maybe make a video on delegates and events and where to use them. Im pretty sure i understand what they are but i struggle when to use them exactly and correctly. Cheers

[@oganovdavid]

Happy birthday, Nick! Keep up 💪

[@MadMathMike]

Excellent demonstration! Thanks for sharing! 😊

[@pablocom]

Thanks for the video again NIck! We found several places on our codebase where we can avoid non necessary memory allocations

[@HuntsWorkshop]

Great video man. Whoever thumbs down your videos just doesn't understand your genius. Their loss.

[@InshuMussu]

ValueTask was always confusing for me but from 8:44 at your video solved my problem. thanks

[@bilalmehrban]

Thank you Nick 💕💕 wonderfull explanation.

[@eliranbl]

Thank you for all videos

[@adoulou340]

Great Video ! thanks

[@bahtiyarozdere9303]

Hello Nick. Thanks for another amazing video. I want to ask, do you use Aspect Oriented Programming?

[@nickchapsas]

I don't mainly because C# doesn't natively support it. I know there are a few ways around that but I think in general there are different ways to tackle what AOP brings to the table, which I find more appropriate in C#.

[@Netpercentage]

Hey dude... Your videos are the bomb... I have noticed the way you use benchmarks and how your code is refactored, its awosome. Man... I have been trying to get these benchmarks on my business logic layer but no luck... I have the business layer dll inside the console app of the same solution. There are no videos showing real scenario use cases. I want to refactor code in the business logic... Are you able to cook us one of them videos my guy... I believe that would be the first

[@granmasterlincoln]

Great video Nick, as expected. I know that doesn't have any relation to coding, but would be cool a video showing your setup.

[@MsbowElite]

Yeah, btw we already know that he is using Ryzen 9 3900X, haha.

[@nickchapsas]

I don't think I will be making a dedicated video on this but I have create an amazon page with all my current gear in case you're interested in that: www.amazon.co.uk/shop/nickchapsas?listId=1E7ERJL49JJW

[@davidwilliss5555]

I have a question: You call the MemoryCache.Set method and pass a TimeSpan. I don't see a Set that takes a TimeSpan. Do you have an extension method that wraps that into a CacheItemPolicy with a sliding expiration or is there some other hidden magic involved?

[@kumar315]

cool stuff...just wanted to check if using a value task on unit tests would be a good idea?..Since we always mock the external API calls is it a good place to use value tasks everywhere with unit tests ?

[@vasugupta1]

Great work

[@twiksify]

Would you say that using ValueTuple over Tuple has similar memory benefits? Assuming that it's used in a context that allows for stack allocation.

[@anishnjain1]

great job

[@SealedKiller]

What font do you use in the editor? And if it's JetBrains Mono, how do you get the 0 with the line and not the dot?

[@nickchapsas]

It’s JetBrains Rider

[@shustypl]

I am curious about the result of the same test if you would remove the caching. How much performance affects the use of ValueTask, where Task should be used for I/O operations (calling api or db).

[@nickchapsas]

ValueTask is slightly slower by nature but always using An actually awaitable task will allocate a bit more if you used ValueTask there.

[@ValueLevit]

Thanks

[@lucaciandrei]

I would say, that perhaps, if in your class, you have multiple private methods that are returning a Task, you can switch them up to a ValueTask, as the methods themselves will be used inside the object's lifecycle only.

[@roflex2]

I know you linked the why and how. But it would be nice to explain why you can't await it twice in the video.

[@nickchapsas]

Yeah originally I thought the video would be bigger so I didn't explain it because I thought it would inflate it more but you're right, I could give a short explanation. Noted.

[@roflex2]

@@nickchapsas love your videos and channel. Keep it up, you are the only person I've seen doing regular c# content

[@OlegKosmakov]

As far as I am aware, since the ValueTask is used in high-performance low-overhead kind of scenarios, it is implemented in a way that it will reuse the ValueTask structure after the result is awaited, and later it might contain results of completely different calculation. That's why awaiting twice is undefined behavior.

[@roflex2]

@@nickchapsas I'd love to see a topic on WPF/data binding with uncommonly used things eg BindingOperations.EnableCollectionSynchronization

[@protox4]

Short answer: because ValueTask can be backed by a custom-implemented IValueTaskSource which may not support multiple awaits.

[@ArnabDeveloper]

Nice

[@kreide847]

Would it be possible for you to open a Discord server for your community?

[@nickchapsas]

I am currently thinking about how I can set it up without being too much of a hassle. Once I sort that out I will let everyone know

[@slowjocrow6451]

I don't understand when you say you can only await it once. If the cache expires you have to await it again... Isn't that "more than once"?