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After editing the .csproj TargetFrameworkVersion element value, it will revert back to it's previous value when reloading the project.
**Steps to Reproduce**:
1. Create a new Android App in Visual Studio
2. Assuming the latest SDKs are installed, the TargetFrameworkVersion will be "v7.0" in the .csproj
3. Open the .csproj and edit the value to "v6.0" and save the file.
4. Reload the project
The TargetFrameworkVersion is back to v7.0
The TargetFrameworkVersion should be v6.0
**Build Date & Platform**:
Microsoft Visual Studio Enterprise 2015
Version 14.0.25431.01 Update 3
Microsoft .NET Framework
Installed Version: Enterprise
Architecture and Modeling Tools 00322-80000-00000-AA000
Microsoft Architecture and Modeling Tools
UML® and Unified Modeling Language™ are trademarks or registered trademarks of the Object Management Group, Inc. in the United States and other countries.
Visual Basic 2015 00322-80000-00000-AA000
Microsoft Visual Basic 2015
Visual C# 2015 00322-80000-00000-AA000
Microsoft Visual C# 2015
Visual C++ 2015 00322-80000-00000-AA000
Microsoft Visual C++ 2015
Windows Phone SDK 8.0 - ENU 00322-80000-00000-AA000
Windows Phone SDK 8.0 - ENU
ASP.NET and Web Tools 2015.1 14.1.20907.0
ASP.NET and Web Tools 2015.1
ASP.NET Web Frameworks and Tools 2012.2 4.1.41102.0
For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563
ASP.NET Web Frameworks and Tools 2013 5.2.40314.0
For additional information, visit http://www.asp.net/
Azure App Service Tools v2.8.1 14.0.11123.0
Azure App Service Tools v2.8.1
Command Bus, Event Stream and Async Manager Merq
Provides ICommandBus, IEventStream and IAsyncManager MEF services for loosely coupled Visual Studio extension components communication and integration.
Common Azure Tools 1.8
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.
Microsoft .NET Core Tools (Preview 2) 14.1.20907.0
Microsoft .NET Core Tools (Preview 2)
Microsoft Azure Mobile Services Tools 1.4
Microsoft Azure Mobile Services Tools
NuGet Package Manager 3.5.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.
OptionsPackage Extension 1.0
OptionsPackage Visual Studio Extension Detailed Info
PreEmptive Analytics Visualizer 1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.
SQL Server Data Tools 14.0.60519.0
Microsoft SQL Server Data Tools
TypeScript tools for Visual Studio
Xamarin 22.214.171.1243 (3b7df6f)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.
Xamarin.Android 126.96.36.199 (96c7ba6)
Visual Studio extension to enable development for Xamarin.Android.
Xamarin.iOS 10.0.1.10 (ad1cd42)
Visual Studio extension to enable development for Xamarin.iOS.
If you use the Project->Properties->Application menu and change the Compile using Android Version drop-down, it will save the change as expected.
The issue was reported here http://forums.xamarin.com/discussion/79582/targetframeworkversion-keeps-automatically-changing and is a problem when working with source control.
Not sure how exactly this is "Resolved" The IDE is still making changes to source code that cant be undone or reverted. Your effectively stuck unless you actually want to commit your code.
*** This bug has been marked as a duplicate of bug 53270 ***