ASP.Net CryptographicException: The input data is not a complete block

This exception coming during Decryption

private string Encrypt(string clearText)
{
    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 });
        encryptor.Key = pdb.GetBytes(32);
        encryptor.IV = pdb.GetBytes(16);
        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;
}

var code = (24 + "AZp4NY3Wq" + 24 + "lp78tsI5g" + 1 + 24).ToString();
var encryptcode = Encrypt(code);
string EncryptionKey = "MAKV2SPBNI99212";

i am sending encrypt text to email and click on that i am matching that text after decryption.

when i check on email text is ok, but when i click on it and it goes to decryption then + sign not there, space come in place of +sign.