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using System;
using Python.Runtime;

namespace Virtualenv.Example
{
    public class Program
    {
        public void Main()
        {
            var pathToVirtualEnv = @"path\to\env";

            Environment.SetEnvironmentVariable("PATH", pathToVirtualEnv, EnvironmentVariableTarget.Process);
            Environment.SetEnvironmentVariable("PYTHONHOME", pathToVirtualEnv, EnvironmentVariableTarget.Process);
            Environment.SetEnvironmentVariable("PYTHONPATH", $"{pathToVirtualEnv}\\Lib\\site-packages;{pythonPath}\\Lib", EnvironmentVariableTarget.Process);

            PythonEngine.PythonHome = pathToVirtualEnv;
            PythonEngine.PythonPath = Environment.GetEnvironmentVariable("PYTHONPATH", EnvironmentVariableTarget.Process);
        }
    }
}