Steps : Search "Path" in windows

Steps : Select "Edit the system enviroment.."

Steps : Click on "Enviroment Valiable" right bottom

Steps : Double CLick on Path Named Variable

Steps : Click on New and add the path

Steps : Click Okay Okay Okay

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for me to run csc from command Prompt

"C:\Windows\Microsoft.NET\Framework\v4.0.30319"

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"C:\Users\UserName\Desktop>csc [options] filename.cs"