Changes in ASP.NET from version 2.0 to 4.0? [closed] - c#

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I wish to learn ASP.NET and found some good videos about it. But the thing is that they are for version 2.0 of the .Net Framework. Has ASP.NET changed drastically from version 2.0 till 4.0?

I would say that you should focus your effort on 4.0. When 2.0 was released Ajax started to go mainstream due the wow factor of google maps, data binding was without Entity Framework or Linq and deployment was more copy and paste. All the tutorials you need can be found on here: http://www.asp.net/web-forms/tutorials

Ofcourse there will be new features added in the newer versions. But the 4.0 version supports all(i guess, or most of the stuff) the features available in the previous versions. So learning 2.0 version will not harm you. Once you get a basic undestanding of the ASP.NET( which you can easily get by stydying 2.0), you can look into the new features introduced in the newer versions.

Here's a documentation of the ASP.NET 4 breaking changes
Also take into consideration that there have been some changes to the validation mode

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Why does Microsoft have both Avalonia UI and .NET MAUI? [closed]

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.Net Conf is currently underway and I learnt about something called Avalonia UI. (I use .NET MAUI) After doing some research, Avalonia UI was primarily a desktop UI framework that now supports Android and iOS.
Since they're both dotNet foundation projects, why are they developing two different multi-platform frameworks? Are there obvious advantages of one over the other since they both use XAML and C# code?
Microsoft does not have that. Avalonia UI is based on Microsoft technology but it's a different company. Basically they are a competitor to .NET MAUI.
The .NET Foundation is something that definitely has close ties with Microsoft, but technically isn't Microsoft. .NET Foundation does a lot of things, but one of them is make sure that open-source projects keep being maintained.
A lot of open-source projects rely on people from the community that do work in their free time. Sometimes things happen and they don't have any time to work on it anymore. Instead of the project going to waste, the .NET Foundation is there to make sure it can be continued, among other things.
So all projects that fall under the .NET Foundation can very much be competitors and all sort of projects, but it's not necessarily developed by Microsoft. And of course we're all friends after all, it's just tech <3
Hope this clears it up a bit.

How to make an asynchronous call on .NET Framework 4.0 without using Microsoft.Bcl.Async nuget package? [closed]

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To give some context, I'm working on a Winforms application on .NET Framework 4.0. I need to call an internal service asynchronously without having to change the .NET Framework version or adding any Nuget packages. I'm familiar in using async/await but our current requirements doesn't allow for .NET framework upgrades
In short: It won't work without it.
Answered here: async/await keywords not available in .net 4.0
Workaround here: How can I use the async keywords in a project targeting.net 4.0

Prerequisites for using C# 6 Roslyn [closed]

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There's a lot of buzz around C# 6
However, I wanted to know that if they work in asp.net and asp.net mvc?
I mean, C# 6 cannot just run in framework 4.5 (Or can it?)
Should we use C# 6 for backend of asp.net/(mvc), because mostly all doesn't have private servers.
So, should we wait for hosters like godaddy to upgrade their system, before we could use much anticipated c# 6?
The preview-release of the C# 6.0 compiler is just that - a compiler. It doesn't target a new version of the .NET Framework. As such, there's nothing new that needs to be installed on your server - you just compile your code with the new compiler, upload it, and you're done.
Of course, this doesn't mean that all features will be available if you're not using a sufficiently up-to-date version of .NET - if you're targeting .NET 2.0, obviously you don't get to use LINQ since that was introduced in .NET 3.5.
Also, a lot of the features you've heard "buzz" about haven't even been implemented yet, even in the preview-release. They're planned, that's all. If there's a particular feature you've heard about that you're wanting to make use of, you should check whether it's even been implemented before you even bother downloading it.
The point though is that the C# compiler and the .NET framework are two completely separate things. There has not (yet) been any announcement of a new version of the .NET framework.
Another point worth bearing in mind though is that the preview-release compiler is exactly what it says - a preview-release. This is NOT the final release, and you need to be aware that features could change or even be removed from under you by the time the final release comes around. How likely that is, I can't say, and the risks involved in using new features introduced with a preview compiler for a production application are for you to weigh.

Is .net 4.5 a major upgrade to 4.0 or is it just a matter of including updating .dll? [closed]

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If my server is currently setup with .net 4.0, is 4.5 a major release or is it something like .net mvc where I just have to include the mvc related dll's in my /bin folder?
.NET 4.5 must be installed on the server. It is not simply a .dll to include. You do have to specify 4.5 in your web.config to use 4.5 features. You only have to include the dlls for packages you use that use the 4.5 framework. I recommend using NuGet package manager to handle this so you don't have to do it manually.
However, in IIS, 4.5 does not appear as a .NET version for application pools and uses the 4.0 runtime. In that sense, it is similar to 3.5 where you need to set your app pool to version 2.0.

What open-source QR Code Generator would you recommend? [closed]

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I'm looking for a library to generate QR codes in .NET I've stumbled across a few paid ones, but very few free ones that look any good. Anyone have experience with a good free open-source library?
Thanks
Take a look at this one http://qrcodenet.codeplex.com/
http://code.google.com/p/zxing/ and How To Use ZXing C# Port might answer your question.
I have been using the other port ZXing.Net with some success. According to the website, it has assemblies available for the following platforms:
.Net 2.0, 3.5 and 4.0
Silverlight 4 and 5
Windows Phone 7.0, 7.1 and 8.0
Windows CE
Windows RT
Unity3D (.Net 2.0 built without System.Drawing reference)
Mono for Android
In past I used this one.
It's really "heavy" (about 6MB) but it worked for me and it's released under Code Project Open License (CPOL). I forgot: C# source code is provided.
Another one is MessagingToolKit, which is provided even with a free license; I don't remember (excuse me) if QR is inside free license or not.

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