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copied!<p>Use a <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.aspx" rel="noreferrer">BackgroundWorker</a>. There is a <a href="http://msdn.microsoft.com/en-us/library/8xs8549b.aspx" rel="noreferrer">BackgroundWorker overview</a> on MSDN.</p> <p>Here is an example of how your code might look:</p> <pre><code>public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { BackgroundWorker backgroundWorker = (BackgroundWorker)sender; for (int i = 0; i < 100; i++) { backgroundWorker.ReportProgress(i); Thread.Sleep(100); } } private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) { textBox1.Text = e.ProgressPercentage.ToString(); } private void button1_Click(object sender, EventArgs e) { backgroundWorker1.RunWorkerAsync(); } } </code></pre> <p>Other notes:</p> <ul> <li>Remember to set <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.workersupportscancellation.aspx" rel="noreferrer">WorkerReportsProgress</a> in the designer if you want the progress to work.</li> <li>When using a BackgroundWorker it is also often useful to use the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.progressbar.aspx" rel="noreferrer">ProgressBar</a> control.</li> <li>If you want to be able to cancel the background worker, that is possible too. See <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.runworkercompleted.aspx" rel="noreferrer">CancelAsync</a> and <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.workersupportscancellation.aspx" rel="noreferrer">WorkerSupportsCancellation</a>.</li> <li>When the background worker completes it fires the <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.backgroundworker.runworkercompleted.aspx" rel="noreferrer">RunWorkerCompleted</a> event.</li> </ul>

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