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copied!<p>I think it is much simpler to use the built-in methods on either <code>Directory</code> or <code>DirectoryInfo</code> to obtain all directories, or files, using the recursive search option:</p> <pre><code>public partial class Form1 : Form { private Action<float> updateProgMethod; public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { updateProgMethod = UpdateProgress; } private void GetDirectorySizeAsync(string path) { backgroundWorker.RunWorkerAsync(path); } private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e) { DirectoryInfo di = new DirectoryInfo((string)e.Argument); di.GetTotalSize(ProgressCallback); } // Takes callbacks from the GetTotalSize() method private void ProgressCallback(float p) { // Invokes update progress bar on GUI thread: this.BeginInvoke(updateProgMethod, new object[] { p }); } // Actually updates the progress bar: private void UpdateProgress(float p) { progressBar.Value = (int)(p * (progressBar.Maximum - progressBar.Minimum)) + progressBar.Minimum; } } public static class IOExtensions { public static long GetTotalSize(this DirectoryInfo directory, Action<float> progressCallback) { FileInfo[] files = directory.GetFiles("*.*", SearchOption.AllDirectories); long sum = 0; int countDown = 0; for (int i = 0; i < files.Length; i++) { sum += files[i].Length; countDown--; if (progressCallback != null && countDown <= 0) { countDown = 100; progressCallback((float)i / files.Length); } } return sum; } } </code></pre> <p>It's hard to guess progress without knowing the number of files or folders first!</p> <p>EDIT: I've improved the code a little.</p>

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