Hashes string using salt and returns string

HashHMAC.cs

private static string CalcHMACSHA256Hash(string plaintext, string salt)
{
    string result = "";
    var enc = Encoding.Default;
    byte[] baText2BeHashed = enc.GetBytes(plaintext),
    baSalt = enc.GetBytes(salt);
    System.Security.Cryptography.HMACSHA256 hasher = new HMACSHA256(baSalt);
    byte[] baHashedText = hasher.ComputeHash(baText2BeHashed);
    result = string.Join("", baHashedText.ToList().Select(b => b.ToString("x2")).ToArray());
    return result;
}