C# Threading/Lock confusion

Question

I have the following code:

var items = new List {\"1\", \"2\", \"3\"}; // 200 items
foreach(var item in items) {
  ThreadPool.QueueUserWorkItem         


        

Answer 1

The following note from MSDN documentation on ThreadPool says it all:

The threads in the managed thread pool are background threads. That is, their IsBackground properties are true. This means that a ThreadPool thread will not keep an application running after all foreground threads have exited.

Your application simply exits (by reaching end of Main) before your threads finish running.