SharePoint 2013 Emulating SharePoint 2010

My company recently switched from SharePoint Server 2010 to SharePoint Server 2013, but for now it is the 2010 Emulation Mode. One of the older (created on SharePoint Server 2007) Visual Studio SharePoint projects does not work after the migration and I need to rewrite it. Eventually we will shut off 2010 Emulation for a pure 2013 environment so my question is - will a SharePoint 2013 Project work on a SharePoint 2013 Server emulating SharePoint 2010 and once we shut off the 2010 Emulation, will it still work?
Rusty CusickSoftware Developer Asked:
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Walter CurtisSharePoint AEDCommented:
What do you mean by "Emulating SharePoint 2010"? Does that mean the site collections have not yet been updated?

Some additional information may be helpful...
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Rusty CusickSoftware Developer Author Commented:
Right now it is in a SharePoint 2013 Server running in SharePoint Server 2010 Mode. Until we get rid of the SharePoint 2010 Mode, I see the attached screen shot "Experience all that SharePoint 2013 has to offer, start now or remind me later". If you click on the Pink Banner, SharePoint 2010 Mode goes away and everything is updated to a pure SharePoint2013. All of the buttons and everything thing on the screen is updated to the way SharePoint 2013 sites look.

That is all I know, a SharePoint 2013 Expert was brought in and I was not part of the migrations (Databases, Files etc)  from SharePoint 2010 to SharePoint 2013 running SharePoint 2010 Mode. It was done so when the users shut down last Friday and the migration was finished, they saw no difference. Expreiance All the SharePoint 2013 has to offer
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Walter CurtisSharePoint AEDCommented:
Thanks for the info. Yes, the site is awaiting an upgrade. Here is a very informative link you need to review;

https://technet.microsoft.com/en-us/library/jj219650.aspx

As a best practice and as much as possible, you need to test your solution in a test environment. If that is not possible, test in an isolated site collection.

Hope that helps...
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Rusty CusickSoftware Developer Author Commented:
Not looking to update the site right now, Customer requirements state that the SharePoint 2010 Mode will remain in place until some yet to be determined date. What I need to know is can I create a new Visual Studio SharePoint Project using the SharePoint 2013 DLL's (Version 15 instead of Version 14) and have it work for both the SharePoint 2010 Mode and the upgrade to SharePoint 2013 sometime in the future.
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Walter CurtisSharePoint AEDCommented:
This of course depends upon what you are trying to do, but generally kind in mind the farm is a 2013 farm with all the files and configurations for a 2013 farm. The site collection upgrade is not going to change that. If your solution runs now in the 2013 farm, it should also run once the site collection upgrade(s) are run. When the sites are upgrade, the farm will not switch hives or core dll's.

Good luck...
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Rusty CusickSoftware Developer Author Commented:
Thank you...I am a lost newbie SharePoint Administrator and SharePoint Developer
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Walter CurtisSharePoint AEDCommented:
Thanks

Hang in there and keep asking questions! You're going in the right direction...
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Walter CurtisSharePoint AEDCommented:
Thanks
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