Vis mig dine - best practices

Kode 

/// <summary>
        /// Copies a folder from one location to another location, including all the files and folders, recursively
        /// </summary>
        /// <param name="source">The source directory to copy</param>
        /// <param name="target">The target directory</param>
        private void CopyFolderAndFiles(DirectoryInfo source, DirectoryInfo target)
        {
            // Check if the target directory exists, if not, create it.
            if (Directory.Exists(target.FullName) == false)
            {
                Directory.CreateDirectory(target.FullName);
            }

            // Copy each file into it’s new directory.
            foreach (FileInfo fi in source.GetFiles())
            {
                fi.CopyTo(Path.Combine(target.ToString(), fi.Name), true);
            }

            // Copy each subdirectory using recursion.
            foreach (DirectoryInfo diSourceSubDir in source.GetDirectories())
            {
                DirectoryInfo nextTargetSubDir = target.CreateSubdirectory(diSourceSubDir.Name);
                CopyFolderAndFiles(diSourceSubDir, nextTargetSubDir);
            }
        }

CSharp kode 

 /// <summary>
 /// Validate if <paramref name="candidate"/> is a valid email address using
 /// regular expresseion.
 /// </summary>
 /// <param name="candidate">String candidate to validate.</param>
 /// <returns>True if <paramref name="candidate"/> is valid, false if not.</returns>
 public static bool IsEmailAddress(string candidate)
 {
     if (candidate == null || candidate.Length == 0)
     return false;
 
     return System.Text.RegularExpressions.Regex.IsMatch(
     candidate, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
 }
 
 /// <summary>
 /// Validate if <paramref name="candidate"/> is a valid IP-address.
 /// </summary>
 /// <param name="candidate">String candidate to validate.</param>
 /// <returns>True if <paramref name="candidate"/> is valid, false if not.</returns>
 public static bool IsIpAddress(string candidate)
 {
     if (candidate == null || candidate.Length == 0)
     return false;
 
     System.Net.IPAddress ipAddr = null;
 
     return System.Net.IPAddress.TryParse(candidate, out ipAddr);
 }