C# DirectoryInfoExtensions - Directory CopyTo method (found at http://channel9.msdn.com/forums/TechOff/257490-How-Copy-directories-in-C/)

DirectoryInfoExtensions.cs

public static class DirectoryInfoExtensions
{
  /*
  Usage
  var source = new DirectoryInfo(@"C:\users\chris\desktop");
  source.CopyTo(@"C:\users\chris\desktop_backup", true);
  */
  public static void CopyTo(this DirectoryInfo source,string destDirectory, bool recursive)
  {
      if (source == null)
          throw new ArgumentNullException("source");
      if (destDirectory == null)
          throw new ArgumentNullException("destDirectory");
      // If the source doesn't exist, we have to throw an exception.
      if (!source.Exists)
          throw new DirectoryNotFoundException("Source directory not found: " + source.FullName);
      // Compile the target.
      DirectoryInfo target = new DirectoryInfo(destDirectory);
      // If the target doesn't exist, we create it.
      if (!target.Exists)
          target.Create();
      // Get all files and copy them over.
      foreach (FileInfo file in source.GetFiles())
      {
              file.CopyTo(Path.Combine(target.FullName, file.Name), true);
      }
      // Return if no recursive call is required.
      if (!recursive)
          return;
      // Do the same for all sub directories.
      foreach (DirectoryInfo directory in source.GetDirectories())
      {     
         CopyTo(directory, Path.Combine(target.FullName, directory.Name), recursive);
      }
  }
}