This question is similar to the one here.

One can easily convert from hex string to byte via the following formula:

    public static byte[] HexStringToBytes(string hex)
    {
        byte[] data = new byte[hex.Length /2];
        int j = 0;
        for (int i = 0; i < hex.Length; i+=2)
        {
            data[ j ] = Convert.ToByte(hex.Substring(i, 2), 16);
            ++j;
        }
        return data;
    }

But is there a built-in function ( inside .net framework) for this?