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    <p>You can use <code>Join</code> or <code>AutoResetEvent</code> to wait until add picture thread finishes, <strong>But you should not use either as explained later on the answer.</strong></p> <p>You can achieve the same results by using <code>AutoResetEvent</code> as alternative to <code>Join</code>; it allows you to setup a blocking-notification, so block before calling the <code>execute()</code> method and only proceed when <code>AddPics</code> thread finishes its job:</p> <pre><code>private AutoResetEvent _finishAddPicsNotifier = new AutoResetEvent(false); private void OnMyButton_Click(object sender, EventArgs e) { //..... new Thread(AddPics) { Priority = ThreadPriority.Highest, IsBackground = true, //will explain later }.Start(); _finishAddPicsNotifier.WaitOne();//this will block until receive a signal to proceed execute();//this method will only be called after the AddPics method finished /..... } private void AddPics() { try{ //....... } finally{ _finishAddPicsNotifier.Set();//when finished adding the pictures, allow the waiting method to proceed } } </code></pre> <p><strong>Note:</strong> Set <code>IsBackground = true</code> to indicates that thread is a background thread so it will not prevent the application from terminating. read more about background thread <a href="http://msdn.microsoft.com/en-us/library/system.threading.thread.isbackground.aspx" rel="nofollow noreferrer">here</a>.</p> <p><strong>Problems:</strong></p> <ul> <li>Since you are using a button click to run the thread, you should add some mechanism to prevent multi-clicks at the same time to run the code multiple time.</li> <li>You are also blocking the UI thread when call <code>Join()</code> or <code>_finishAddPicsNotifier.WaitOne()</code>.</li> </ul> <p><strong>To fix all of that</strong>, a good design is to define a method <code>OnFinishAddingPictures</code> and call it whenever finish adding images, inside this new method call <code>execute()</code>, you should also remove the previous <code>execute()</code> call from button click: </p> <pre><code>private readonly object _oneAddPicturesLocker = new object(); private void OnMyButton_Click(object sender, EventArgs e) { //..... new Thread(AddPics) { Priority = ThreadPriority.Highest, IsBackground = true, }.Start(); } private void AddPics() { if (Monitor.TryEnter(_oneAddPicturesLocker)) { //we only can proceed if no other AddPics are running. try { //..... OnFinishAddingPictures(); } finally { Monitor.Exit(_oneAddPicturesLocker); } } } private void OnFinishAddingPictures() { execute(); } </code></pre> <p><strong>Note:</strong></p> <ul> <li>We get rid of the blocking using this mechanism.</li> <li>We are sure One and Only one call to the <code>AddPics</code> are executed at a moment.</li> <li>Always remember to check <code>InvokeRequired</code> and use <code>control.Invoke(/*..*/)</code> whenever accessing form or control methods and properties from a thread that <strong>is not the UI thread</strong>.</li> </ul>
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    1. POHow can I wait for a thread to finish running other than by calling thread.Join()?
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    1. USBrainStorm.exe
    1. USJalal Said
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    1. CO@Lokesh: Did you try this approach, does it serves your needs?
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      1. USJalal Said
 

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