Get process affinity mask

public static int GetProcessAffinityMask(string processName = null)
    {
        Process myProcess = GetProcessByName(ref processName);

        int processorAffinity = (int)myProcess.ProcessorAffinity;
        Console.WriteLine("Process {0} Affinity Mask is : {1}", processName, FormatAffinity(processorAffinity));

        return processorAffinity;
    }

    public static Process GetProcessByName(ref string processName)
    {
        Process myProcess;
        if (string.IsNullOrEmpty(processName))
        {
            myProcess = Process.GetCurrentProcess();
            processName = myProcess.ProcessName;
        }
        else
        {
            Process[] processList = Process.GetProcessesByName(processName);
            myProcess = processList[0];
        }
        return myProcess;
    }

    private static string FormatAffinity(int affinity)
    {
        return Convert.ToString(affinity, 2).PadLeft(Environment.ProcessorCount, '0');
    }
}

private static void Main(string[] args)
{
    GetProcessAffinityMask();

    Console.ReadKey();
}
// Output:
// Process Test.vshost Affinity Mask is : 11111111