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    <p>EDIT: Okay, now we have more information and know that the question isn't <em>really</em> about a user interface, it's easy:</p> <pre><code>List&lt;Task&gt; listOfTasks = GetListOfTasks() List&lt;Thread&gt; threads = new List&lt;Thread&gt;(); foreach(Task task in Tasks) { DoSomeWork work = new DoSomeWork(task); Thread workerThread = new Thread(work.CompleteTask); workerThread.Start(); threads.Add(workerThread); } // Now all the threads have started, Join on them in turn to wait // for them to finish. DON'T DO THIS IN A UI THREAD IN A NORMAL APP. foreach (Thread thread in threads) { thread.Join(); } </code></pre> <p>Of course, using the TPL's <code>WaitForAll</code> <em>is</em> a better idea than this - if you can use it, do so. But if you're using plain threads, <code>Join</code> is fine.</p> <hr> <p>EDIT: I've been assuming you're writing a Windows Forms application, based on the Form1_Load method. It would be helpful if you could give more context in the question.</p> <p>Well, your threads are unlikely to have all finished immediately after you've started them all... and you shouldn't block the UI thread <em>waiting</em> for them to finish, as your UI will hang.</p> <p>Instead, you should make each <code>DoSomeWork</code> task call back into the UI when it's finished. Either <code>DoSomeWork</code> could have an event you could add a handler to, or you could pass a completion handler delegate into the constructor, or perhaps it knows about the form directly and can call back itself - it depends on what it's doing really.</p> <p>Anyway, when the task has effectively finished, you can post back to the UI thread using <code>Control.BeginInvoke</code>. The form could keep track of how many tasks has finished, so that if it needs to do something when <em>everything</em> has finished, it can do so.</p> <p>If this doesn't help, please give more information about what you want to happen when all the tasks have finished, and what those tasks are doing.</p>
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    1. CONo I am not working on a Windows Form Application. I am just testing the application which will eventually hosted in a windows serviece. Basically at the form_load() I am getting list of contacts to which I have to make Phone calls. Each phonecall is handled in a thread. Once all the calls are made, I have to invoke a Stored procedure telling that all the calls are made. I am just not sure how I will be able to do that.
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    2. CO@Sandeep: Oh, well that changes the situation completely. *Please* give more information in future. If you're going to include something talking about forms, you should expect answers that relate to a UI.
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    3. COSorry. I should have did mentioned the complete scenario.
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