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    <p>You can use the <a href="http://dotnetperls.com/backgroundworker-introduction" rel="nofollow noreferrer">BackgroundWorker</a>, which is easy to use.</p> <p>Also, I'm not sure it's completely safe (I could be wrong, though) to show the SaveFileDialog in the new thread. My recommendation would be a flow as such:</p> <ol> <li>Show SaveFileDialog on main thread.</li> <li>Pass file name to a method, which is then called asynchronously.</li> </ol> <p>Here's an example implementation, without the use of <code>BackgroundWorker</code>:</p> <pre><code>private void button1_Click(object sender, EventArgs e) { SaveFileDialog sfd = new SaveFileDialog(); sfd.InitialDirectory = "C:\\"; sfd.Filter = "All files (*.*)|*.*"; sfd.FilterIndex = 1; sfd.RestoreDirectory = true; if (sfd.ShowDialog() == DialogResult.OK) { // Invoke the SaveFile method on a new thread. Action&lt;string&gt; invoker = new Action&lt;string&gt;(SaveFile); invoker.BeginInvoke(sfd.FileName, OnSaveFileCompleted, invoker); } } protected void SaveFile(string fileName) { // save file here (occurs on non-UI thread) } protected void OnSaveFileCompleted(IAsyncResult result) { Action&lt;string&gt; invoker = (Action&lt;string&gt;) result.AsyncState; invoker.EndInvoke(result); // perform other actions after the file has been saved (also occurs on non-UI thread) } </code></pre> <p>Note that all actions performed on non-UI threads, must only affect non-UI elements. If you want to modify UI elements, you should marshal the call back to the UI thread, by using <code>Control.Invoke</code> (e.g. <code>this.Invoke</code>). See <a href="https://stackoverflow.com/questions/1194918/why-am-i-getting-a-cross-thread-operation-not-valid-exception-in-the-callback-m/1194997#1194997">this post</a> for further details.</p>
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    1. POHow to use SaveFileDialog asynchronously?
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    1. POHow to use SaveFileDialog asynchronously?
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    1. COIn my case it works either with BackgroundWorker or with ThreadStart.
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    2. COThank you for the code but what exactly is "Action", is it a custom type you have built for this purpose? Could you please give me a hint on how I can implement that?
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    3. COI haven't built it, no. System.Action<T> is a generic delegate type in .NET, which is used for invoking methods which return _void_ and takes one parameter of type _T_, e.g. void SaveFile(string fileName), where _T_ in this case is _string_.
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