Generate random password from GUID

// generate random password from GUID
string password = string.Empty;
string guid = Guid.NewGuid().ToString().Replace("-", string.Empty);
Random random = new Random(DateTime.Now.Millisecond);
for (int i = 0; i < 8; i++)
    password += guid.Substring(random.Next(0, guid.Length - 1), 1);