iv = “0000000000000000”
key = “WwXyBHp3itt+edYciiSTcg==”

php code :

<?php

function encrypt(mixed $value): string
{
    

$iv = "0000000000000000";
// Encrypt the value using AES-128-CBC and a secret key
$value = openssl_encrypt($value, strtolower(CIPHER),
secret, 0, $iv);
// Check if encryption was successful
if ($value === false) {
throw new EncryptException('Could not encrypt the data.');
}
// Encode IV to Base64 for easier transmission
$iv = base64_encode($iv);
// Create a JSON object containing IV and the encrypted value
$json = json_encode(compact('iv', 'value'), JSON_UNESCAPED_SLASHES);
// Check if JSON encoding was successful
if (json_last_error() !== JSON_ERROR_NONE) {
throw new EncryptException('Could not encrypt the data.');
}
// Return the JSON encoded and Base64 encoded result
return $value; //base64_encode($json);
}
const secret='WwXyBHp3itt+edYciiSTcg==';
const CIPHER = 'AES-128-CBC';
$plain='pay/v1/inquiry#1735222907#POST#WwXyBHp3itt+edYciiSTcg==';

echo encrypt($plain);

result :

1O4fDiwtwOqLHc0eOXm9wFGT3TjWpIKLrVGuq0JI67a4pVTaT1F7ZNnJB8fJNdRl1ZG6xNb9obnFQUeUfSahTQ==

currect result is this.
i coverted code to c#:

private const string Secret = "WwXyBHp3itt+edYciiSTcg==";
        
        public static string Encrypt(string value)
        {
            using (Aes aes = Aes.Create())
            {
                aes.Key = Convert.FromBase64String(Secret);
                aes.Mode = CipherMode.CBC;
                aes.Padding = PaddingMode.PKCS7;

                // Generate a random initialization vector (IV)
                //aes.GenerateIV();
                byte[] iv = Encoding.ASCII.GetBytes("0000000000000000");

                using (ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, iv))
                {
                    using (var ms = new System.IO.MemoryStream())
                    {
                        using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
                        {
                            byte[] inputBuffer = Encoding.UTF8.GetBytes(value);
                            cs.Write(inputBuffer, 0, inputBuffer.Length);
                            cs.FlushFinalBlock();
                            byte[] encrypted = ms.ToArray();

                            // Encode IV to Base64 for easier transmission
                            string ivBase64 = Convert.ToBase64String(iv);
                            string valueBase64 = Convert.ToBase64String(encrypted);

                            // Create a JSON object containing IV and the encrypted value
                            var jsonObject = new { iv = ivBase64, value = valueBase64 };
                            string json = JsonConvert.SerializeObject(jsonObject);

                            // Return the Base64 encoded result
                            return valueBase64; //Convert.ToBase64String(Encoding.UTF8.GetBytes(json));
                        }
                    }
                }
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            
            textBox1.Text = textBox1.Text = Encrypt("pay/v1/inquiry#1735222907#POST#WwXyBHp3itt+edYciiSTcg==");
          
        }

but result :

/p9KiDT+1wBJzJYFqejXKIsAFD0GxqKUhbjW2Pjl4JVvN13VMoLw5SC1idO9JGYn09RywdHXXEE5FCAwfKxsOA==

this result is incorrect and doesn’t work for base server.
please help me to resolve c# code issue.