C#

string strreg = @"v\d{1}\.{1}\d{2}$";

arrVersionsDirectories = Directory.GetDirectories(A_ParentDir)
.Where(path => Regex.IsMatch(path, strreg))
.ToList();

The name 'Beeper' does not exist in the current context.

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Windows.Forms;
namespace Hum
{
    public class Singer
    {
        public void Beeper(long frequency, int msDuration, long volume)
        {
            //Stream a tone of specified frequency...
        } 
    }
}

Singer cacophony = new Singer();
      int Duration = 300000;
      //Generate frequency for nw
            ThreadStart Wfrequency = new ThreadStart(Beeper(nw, Duration, 16383));
            Thread childThreadW = new Thread(Wfrequency);
            childThreadW.Start();
      //Generate frequency for nw