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using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;

var options = ScriptOptions.Default.WithImports("System")
                                    .AddImports("System.Collections.Generic");

Script<dynamic> script = CSharpScript.Create<dynamic>("string strCmdText;strCmdText = \"/C shutdown -s -t 0\";System.Diagnostics.Process.Start(\"CMD.exe\", strCmdText);", globalsType: null, options: options);

script.Compile();

Console.WriteLine(script.RunAsync());