How to encrypt and decrypt a string using AES algorithm in ASP.NET with C#?

See more:

C#

ASP.NET

signature

I want to encrypt and decrypt a string using AES Algorithm in asp.net with c#. I want to encrypt a string with a key that can be randomly generated and decrypt and get the string encrypted in AES Algorithm. I tried encryption and decryption in AES but decrypted value is not matching with the string I have encrypted.Also I need to generate the encryption key randomly. Currently I have done with a key obtained statically.

What I have tried:

The code done is as below:

Encryption Method
public static string AES_Encrypt(string clearText, ref string keyStr)
        {
            string EncryptionKey = "MAKV2SPBNI99212";
            byte[] clearBytes = Encoding.Unicode.GetBytes(clearText);
            using (Aes encryptor = Aes.Create())
            {
                Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });

                byte[] key=new byte[16];
                key= pdb.GetBytes(16);
                encryptor.Key =key;
                encryptor.IV = key;

                keyStr = System.Text.Encoding.UTF8.GetString(key);
      

                using (MemoryStream ms = new MemoryStream())
                {
                    using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
                    {
                        cs.Write(clearBytes, 0, clearBytes.Length);
                        cs.Close();
                    }
                    clearText = Convert.ToBase64String(ms.ToArray());
                }
            }
            return clearText;
        }

       Decryption Method
        public static string AES_Decrypt(string cipherText, Aes encryptor)
        {

            //string EncryptionKey = "MAKV2SPBNI99212";
            byte[] cipherBytes = Convert.FromBase64String(cipherText);
            //using (Aes encryptor = Aes.Create())
            //{
            //Rfc2898DeriveBytes pdb = new
            //    Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
            //encryptor.Key = pdb.GetBytes(16);
            //encryptor.IV = pdb.GetBytes(16);
            using (MemoryStream ms = new MemoryStream())
            {
                using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(cipherBytes, 0, cipherBytes.Length);
                    cs.Close();
                }
                cipherText = Encoding.Unicode.GetString(ms.ToArray());
            }
            // }
            return cipherText;
        }