How to use multi threading in a For loop

class Program
{

    static int workingCounter = 0;
    static int workingLimit = 10;
    static int processedCounter = 0;

    static void Main(string[] args)
    {
        string[] files = Directory.GetFiles("C:\\Temp");
        int checkCount = files.Length;
        foreach (string file in files)
        {
            //wait for free limit...
            while (workingCounter >= workingLimit)
            {
                Thread.Sleep(100);
            }
            workingCounter += 1;
            ParameterizedThreadStart pts = new ParameterizedThreadStart(ProcessFile);
            Thread th = new Thread(pts);
            th.Start(file);
        }
        //wait for all threads to complete...
        while (processedCounter< checkCount)
        {
            Thread.Sleep(100);
        }
        Console.WriteLine("Work completed!");
    }

    static void ProcessFile(object file)
    {
        try
        {
            Console.WriteLine(DateTime.Now.ToString() + " recieved: " + file + " thread count is: " + workingCounter.ToString());
            //make some sleep for demo...
            Thread.Sleep(2000);
        }
        catch (Exception ex)
        {
            //handle your exception...
            string exMsg = ex.Message;
        }
        finally
        {
            Interlocked.Decrement(ref workingCounter);
            Interlocked.Increment(ref processedCounter);
        }
    }
}

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