ThreadPool frustrations - Thread creation exceeding SetMaxThreads

Task Parallel Library can help you:

List<task> tasks = GetTasks();

Parallel.ForEach(tasks, new ParallelOptions { MaxDegreeOfParallelism = 5 }, 
  task => {ReportGenerator worker = new ReportGenerator(task.Code, id); 
           worker.Go();});

What does MaxDegreeOfParallelism do?

There is a limitation in SetMaxThreads in that you can never set it lower than the number of processors on the system. If you have 8 processors, setting it to 5 is the same as not calling the function at all.