Encryption & Decryption AES C#, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.IO;
using System.Security;
using System.Security.Cryptography;
using System.Text;

namespace Rextester
{

public class Program
    {
    private static byte[] EncryptStringToBytes_Aes(string plainText)
        {
            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException("plainText");
           /* if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");*/
            byte[] encrypted;
            // Create an Aes object
            // with the specified key and IV.
            using (Aes aesAlg = Aes.Create())
            {
            Console.WriteLine(Convert.ToBase64String(aesAlg.Key));
                        Console.WriteLine(Convert.ToBase64String(aesAlg.IV));
                //aesAlg.Key = Key;
                //aesAlg.IV = IV;

// Create a decrytor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key
, aesAlg.IV);

// Create the streams used for encryption.
                using (MemoryStream msEncrypt = new MemoryStream())
                {
                    using (CryptoStream csEncrypt = new CryptoStream(msEncrypt
, encryptor, CryptoStreamMode.Write))
                    {
                        using (StreamWriter swEncrypt = new StreamWriter(
csEncrypt))
                        {

//Write all data to the stream.
                            swEncrypt.Write(plainText);
                        }
                        encrypted = msEncrypt.ToArray();
                    }
                }
            }
            // Return the encrypted bytes from the memory stream.
            return encrypted;

}
        /*private static string DecryptStringFromBytes_Aes(byte[] cipherText)
        {
            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException("cipherText");
            /*if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException("IV");

// Declare the string used to hold
            // the decrypted text.
            string plaintext = null;

// Create an Aes object
            // with the specified key and IV.
            using (Aes aesAlg = Aes.Create())
            {
               // aesAlg.Key = Key;
                //aesAlg.IV = IV;

// Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key
, aesAlg.IV);

// Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream(cipherText))
                {
                    using (CryptoStream csDecrypt = new CryptoStream(msDecrypt
, decryptor, CryptoStreamMode.Read))
                    {
                        using (StreamReader srDecrypt = new StreamReader(
csDecrypt))
                        {

// Read the decrypted bytes from the decrypting 
stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd();
                        }
                    }
                }

}
            return plaintext;
        }*/

public static void Main(string[] args)
        {
    Console.WriteLine(Convert.ToBase64String(EncryptStringToBytes_Aes("muthumani")));
     //Console.WriteLine((DecryptStringFromBytes_Aes("NNtLcDPp/F53GxRwKfucZA=="));
        }  
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 16 Mb, average nr of threads: 3