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I want to update one of our projects from .Net 4 to 4.5 to use some of the new features, but a lot of the clients using the program still run on XP Embedded, which can't install .Net 4.5 
And if if I could make the change, it would require all clients to install .Net 4.5, something that might not sit well with some users.
This also raises the question of sticking with what works vs keeping up with the latest trends (an almost impossible feat).
I have at least switched from VS 2010 to 2013 CE.
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I think that if you are running VS 2013 you can't even target .net 4.0 on XP, please correct me if I'm wrong but I swear I read that somewhere.
.net 4.0 isn't that old though, at least you're not stuck on 2.0 or something! The main thing in 4.5 is async/await, and you can use it in 4.0 with the Async Targeting pack from Microsoft.
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I'll have to test that, but using .Net 4 compiled w 2010 works fine on XP.
Yes, at least it's not that old 
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Maybe it's C++ I'm thinking off
But when targeting 4.0 on a machine with 2012+ installed, I think there's some gotcha about bugs though because 4.5+ replaces the 4.0 compiler and bugs present in 4.0 but fixed in 4.5+ won't be apparent when debugging on your own machine, but things can crash and burn on the target machine. Something to keep in mind!
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Thanks, I'll definitely have to test before deploying.
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Yes, the only really big deal I've seen with 4.5 over 4.0, in my recent baptism of fire, is async/await. But as @JMK-NI notes, you can still pull the same tricks with a small workaround. And they are pretty cool tricks. 
No object is so beautiful that, under certain conditions, it will not look ugly. - Oscar Wilde
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The async / wait is exactly why I want to upgrade. At least our server side has a min requirement of Server 2008, so I can update that to .Net 4.5
We are also doing a major update from v1 of our SW to v2 which requires a reinstall because we changed the update mechanism and a whole bunch of other stuff. This would have been an ideal opportunity for the .Net upgrade as well.
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You can target it, but there's no guarantee that you'll get the same behaviour on your computer with .NET 4.5 installed as you'll see on the computer which only has 4.0 installed. Any 4.0 bugs fixed in 4.5 will still be fixed on your computer when you target 4.0, but the fix probably won't be available for an XP computer.
There was some suggestion that Visual Studio would try to preserve the 4.0 bugs when you target 4.0, but that doesn't seem to happen.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Do more with less.
Don't use the latest simply to use the latest.
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Forgive me if this is a repost, I just thought that you'd all like to know the true story about why the new Macbook only has ONE USB port:
Clickety[^] 
Joke is probably lost on you if you actually do understand Spanish, but what the heck... 
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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I'd just like a chance to prove that money can't make me happy.
Me, all the time
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From some of the comments, it appears a lot of people think he really is an Apple engineer. 
Pretty funny though. 
There are only 10 types of people in the world, those who understand binary and those who don't.
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Guess not everyone knows Spanish...
BTW: Do you mean to say that he isn't????
Anything that is unrelated to elephants is irrelephant
Anonymous
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The problem with quotes on the internet is that you can never tell if they're genuine
Winston Churchill, 1944
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I'd just like a chance to prove that money can't make me happy.
Me, all the time
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Johnny J. wrote: Guess not everyone knows Spanish
I don't think you need to know Spanish to know that was fake.
There are only 10 types of people in the world, those who understand binary and those who don't.
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I have a little emergency here and if I don't get it to work, I will have to come tomorrow or even sunday.
I had no contact with this project before, so I'm in close contact to the developer team, mostly by mail. now I have finally got the whole project to compile and can start to fix the problem as soon as I get a valid username and password.
And this is the moment our Admon chose to take the Exchange server offline. I can't even open the mail with relevant phone numbers now. Do you think the police will ask many questions when they find an administrator face down in the water?
The language is JavaScript. that of Mordor, which I will not utter here
This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.
"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."
If software development were a circus, we would all be the clowns.
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Shouldn't do: it's "Pest control" not murder...
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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And that is why contacts should be maintained outside of the e-mail system as well.
The paperless society is a myth and should remain that way.
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The whole thing was not exactly planned and all I have is helpful mails from all directions.
The language is JavaScript. that of Mordor, which I will not utter here
This is Javascript. If you put big wheels and a racing stripe on a golf cart, it's still a f***ing golf cart.
"I don't know, extraterrestrial?"
"You mean like from space?"
"No, from Canada."
If software development were a circus, we would all be the clowns.
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I have always maintained that we will have a paperless society when we have a paperless bathroom....
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How do you use the three seashells?
Some men are born mediocre, some men achieve mediocrity, and some men have mediocrity thrust upon them.
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I've been told that "Sleep is highly overrated." Been up early for the last two weeks trying to finish a project....
Charlie Gilley
<italic>Stuck in a dysfunctional matrix from which I must escape...
"Where liberty dwells, there is my country." B. Franklin, 1783
“They who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.” BF, 1759
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Sleep is a prerequisite for health. People that say that it is overrated should not even be allowed to drive
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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Agree. The mind needs rest. During the time of dreamless sleep, the mind gets complete rest, is what they say. IMHO, this is absolutely necessary for rejuvenation.
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Interesting, although my preference is a sleep of dreaming,if I don't dream for a long time, I start to feel empty. I agree that it is necessary though, had my share of sleepless nights.
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