public static class CopyUtility
{
public static void CopyAllFiles
(string sourceDirectory, string targetDirectory, bool recursive)
{
                if (sourceDirectory == null)
                    throw new ArgumentNullException(@"C:/Synaps");
                if (targetDirectory == null)
                    throw new ArgumentNullException(@"C:/Backup");

CopyAllFiles(new DirectoryInfo(sourceDirectory), new
DirectoryInfo(targetDirectory), recursive);
}

public static void CopyAllFiles
(DirectoryInfo source, DirectoryInfo target, bool recursive)
            {
                if (source == null)
                    throw new ArgumentNullException(@"C:/Synaps");
                if (target == null)
                    throw new ArgumentNullException(@"C:/Backup");

                if (!source.Exists)
                    target.Create();

foreach (FileInfo file in source.GetFiles())
                {
                    file.CopyTo(Path.Combine(target.FullName, file.Name), true);
                }
                if (!recursive) return;
foreach (DirectoryInfo directory in source.GetDirectories())
{
CopyAllFiles(directory, new DirectoryInfo(Path.Combine
(target.FullName, directory.Name)), recursive);
}
}
}