Under Windows C # command to run a simple configuration environment

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Configuring the system environment variables

System Properties -> Advanced System Settings -> Environment Variables. Found in the system environment variable Path, add the directory C:\Windows\Microsoft.NET\Framework\v4.0.30319where Frameworkthe operating system, there may be Framework64; v4.0.30319can select the version needed, but the default installation of the system relatively old version, v4.0.30319only applies to C # 5 or less.