How to change language version in Visual Studio 2015

Go to ProjectPropertiesBuildAdvancedLanguage VersionOK as shown with detail steps and screen shots below:

Follow these steps to change the language version of your project

1: Open your project with Visual Studio 2012, 2013 or 2015, click on View from Menu and then click on Solution Explorer

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2: From Solution Explorer, Right Click on the project and Properties from context menu

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3: From properties dialog, select the tab Build and click on Advanced button

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4: Now, from Advanced Build Settings dialog, select Language Version and click OK button. Thats it.

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Try this..

Project -> Properties -> Build -> Advanced -> Language Version