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By dotCore
via ericlippert.com
Published: Apr 06 2013 / 02:43

The C# compiler has a /langversion switch that is rarely used; most people do not know what it is for, and if asked to guess, most guess wrong. So let me disabuse you of your wrong guess right away: the purpose of the langversion flag is not to decide what C# language version to use. It is not a "go into compatibility mode" switch or a "use a previous version of the compiler" switch.
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