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Categories / C# Tutorial / File Directory Stream

 

Use FileStream to read a file selected from OpenFileDialog

using System; using System.Windows.Forms; using System.IO; class MainClass {   public static void Main()    {     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");       int b;       while ((b = inStream.ReadByte()) > -1)         outStream.WriteByte( (byte) b);       outStream.Flush();       outStream.Close();       inStream.Close();     }   } }