/* Mastering Visual C# .NET by Jason Price, Mike Gunderloy Publisher: Sybex; ISBN: 0782129110 */ /* Example15_11.cs illustrates use of FileStreams */ using System; using System.Windows.Forms; using System.IO; public class Example15_11 { [STAThread] public static void Main() { // use an open file dialog to get a filename OpenFileDialog dlgOpen = new OpenFileDialog(); dlgOpen.Title="Select file to back up"; if (dlgOpen.ShowDialog() == DialogResult.OK) { FileStream inStream = File.OpenRead(dlgOpen.FileName); FileStream outStream = File.OpenWrite(dlgOpen.FileName + ".bak"); byte[] buf = new byte[4096]; int bytesRead; // copy all data from in to out while ((bytesRead = inStream.Read(buf, 0, 4096)) > 0) outStream.Write(buf, 0, bytesRead); // clean up outStream.Flush(); outStream.Close(); inStream.Close(); } } }