salt and hash method

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C#

Okay. My salt value is ???? i not sure why here is my method for the salt and hash

Salt method

UnicodeEncoding utf16 = new UnicodeEncoding();

if (utf16 != null)
{

Random random = new Random(unchecked((int)DateTime.Now.Ticks));

if (random != null)
{

byte[] saltValue = new byte[8];

random.NextBytes(saltValue);

string saltValueString = utf16.GetString(saltValue);

Hash method

UnicodeEncoding encoding = new UnicodeEncoding();

SHA512Managed hashing = new SHA512Managed();

string salt = string.Empty;

if (tb_password.Text != null && hashing != null && encoding != null)
{

if (salt == null)
{
// Generate a salt string.
salt = encoding.GetString(saltValue);
}

byte[] binarySaltValue = new byte[8];
binarySaltValue[0] = byte.Parse(salt.Substring(0, 2), System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture.NumberFormat);
binarySaltValue[1] = byte.Parse(salt.Substring(2, 2), System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture.NumberFormat);
binarySaltValue[2] = byte.Parse(salt.Substring(4, 2), System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture.NumberFormat);
binarySaltValue[3] = byte.Parse(salt.Substring(6, 2), System.Globalization.NumberStyles.HexNumber, CultureInfo.InvariantCulture.NumberFormat);


byte[] valueToHash = new byte[8 + encoding.GetByteCount(tb_password.Text)];
byte[] binaryPassword = encoding.GetBytes(tb_password.Text);

binarySaltValue.CopyTo(valueToHash, 0);
binaryPassword.CopyTo(valueToHash, 8);

byte[] hashValue = hashing.ComputeHash(valueToHash);

string hashedPassword = salt;

foreach (byte hexdigit in hashValue)
{
hashedPassword += hexdigit.ToString("X2", CultureInfo.InvariantCulture.NumberFormat);
}