creating new threads in a loop

Question

I\'m trying to understand why this code is not working.

    private static object _lock;

    public static void Main (string[] args)
    {
        Thread th         


        

Answer 1

Your lock does not do anything at all; only one thread is locking on that object - the one that is starting the others. Those other threads never contest for that lock at all.

Answer 2

Because each thread is refering to the loop variable, and does not get its own copy at the time you create the thread.

Notice that the compiler is warning you: "Access to a modified closure".

    foreach (int num in Enumerable.Range(0,5))
    {
        int loopnum = num;

        thread = new Thread(() => print(loopnum.ToString())); 
        thread.Start();  
    }