Function for Creating Random key

public static string CreateKey(int length)
        {
            byte[] random = new byte[length / 2];
            RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();
            rng.GetBytes(random);
            StringBuilder Key = new  StringBuilder(length);
            for (int i = 0; i < random.Length; i++)
                Key.Append(String.Format("{0:X2}", random[i]));
            return Key.ToString();
        }