Which is better for Windows Phone Development - Silverlight or WinRT? [closed] - windows-phone-8.1

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I have a Windows Phone 8.1 Silverlight App. I do not need an Universal App. I just need my app to run on Windows Phone Devices. So, should I continue my app on the Silverlight platform or should I develop it on WinRT? Will having it developed on Silverlight be a problem in the near future? What are the pros and cons? Also, which has got more support on forums, which is more powerful and which is the one MS supports more?

Develop it as a Universal App, but have it target Mobile only. UWP (Universal Windows Platform) has more support now. RT & Silverlight are essentially obsolete.

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What is prerequisite to create Universal App in Visual Studio? [closed]

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I want to create universal app which can work in Windows 8 Desktop and Windows phone 8 and higher version.
Can anybody suggest what tools I should use?
Visual Studio - Version?
Any special plug in with Visual Studio?
For Windows 8 and Windows Phone 8 you'll need Visual Studio 2012 or higher.
Just check the project templates for the desired project type:
However:
Please note that your so called "higher versions" will only work up to Windows 8.1 and Windows Phone 8.1.
If you want to create and deploy the same app for Windows 10, you have to use Visual Studio 2015!
If you want to develop some uni apps for windows 8/8.1, you can you Visual Studio 2012 or higher. For desktop applications, you can use only WPF or WinForms, but I suppose, you go for Metro apps.

Is it a must to learn html5/javascript for cross platform development? [closed]

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Based on my research, most (if not all) frameworks use html5 and javascript when it comes to cross platform mobile development. Are there any that use good ol' java or some other language? I haven't gone deep into front-end development and design, that's why.
EDIT: Came across this, and it cleared up my misconceptions!
If By cross-platform, you mean web-based apps? then you have to use html-javascript-css technology. (Phonegap, codova etc) but there is also C#-based apps, like those built using the Xamarin platform.
But native app development has more performace advantage over cross-platform for obvious reasons. :)
There are a lot Frameworks to work for cross platform developments.
I would recommend Ionic UI Framework, it built on Angular JS.
There is Xamarin Framework for cross platform mobile development using C#, but it's free version very limited.

upgrade from WP7 app to WP8 [closed]

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I have a WP 7.1 app in the marketplace, but some features crash in WP 8.
I don't use VS 2010 anymore and would like to take the opportunity to create a WP8 version of the app.
Imagine that I have a user that runs my 7.1 app on his Windows Phone 8 and that he has already saved data to isolated storage. Will he see the WP 8 version of my app as an upate? Will he lose data already stored in Isolated Storage?
No, the user will not lose data in the isolated storage as long as it's an update to the existing app. Make sure you don't replace the old xap, add a new one for WP8 instead.
This is my app that have got both WP7.1 and WP8 xaps. You should see something similar in your dashboard once you uploaded your WP8 version.

Telerik Test Studio for automation testing Windows Phone application [closed]

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Some my friends suggested me use Telerik Test Studio for automation testing on Windows Phone application.
But I read many time at documentation page of Telerik Test Studio on http://www.telerik.com/teststudio as well as videos on Youtube but I coudn't find any realted documents for Automation Testing for Windows Phone application.
So I would like to ask whether this tool used for automation testing WP apps. I have to use this tool because of requirement of my project.
Thanks in advance.
You didn't look very hard.
"Craft automated tests for any iOS / Android / Windows Phone 8 native, web and hybrid app. Test across multiple browsers. " (http://www.telerik.com/mobile-testing)
And anyway, if you have to use it, then you must have it, and so you should be asking Telerik

Can a win phone 8 app run on win surface rt? [closed]

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If not then what all modifications would be needed for the same. I have an app written for Windows Phone 8 and have to port it for Windows Surface RT. What all are the key points to look for and if possible any documentations pointing to the same.
No, you can not directly port. If you have used MVVM pattern then you can reuse you MODEL and VIEMODEL. You have to modify VIEW only. For more information on MVVM you can look at the MSDN Documentation
No Windows Phone apps cannot run directly on any other device other than windows phone.
That said, MOST of the code can be reused.
Look into Portable class libraries (PCL).
These libraries allow you to write code that is reusable across multiple platforms.
PCL's -
MSDN Document on Portable Class Libraries