Something

public class WorkDispatcher
{
    object syncBlock = new object();
    int dispatchCount = 0;
    
    public void Dispatch(IWorker worker)
    {
        Console.WriteLine("Locking this");
        lock (this.syncBlock)
        {
            Thread thread = new Thread(worker.DoWork);
            Console.WriteLine("Starting a thread to do work.");
            dispatchCount++;
            Console.WriteLine("Dispatched " + dispatchCount);
            thread.Start(this);
            
            Console.WriteLine("Wait for the thread to join.");
            thread.Join();
        }
        Console.WriteLine("Now we DO get here.");
    }
}