public static void DecryptFile(string fileName) { if (File.Exists(fileName)) { byte[] encrypted = File.ReadAllBytes(fileName); DateTime startTime = DateTime.Now; string decrypted = DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV); DateTime finishTime = DateTime.Now; TimeSpan decryptionTime = finishTime - startTime; string decryptedFileName = StringOperations.CreateDecryptionFileName(fileName, decryptionTime.TotalMilliseconds); File.WriteAllText(decryptedFileName, decrypted); } }