How to convert IP address into MAC address byte array?

Question

I'm trying to convert IP address to MAC address and then convert it to byte array. I'm stuck in the first part and not sure how to do this. I seen some search results talking about System.Net.NetworkInformation.NetworkInterface but not sure how to use it.

This is my code which needs MAC byte array. How to do this?

[DllImport("iphlpapi.dll", ExactSpelling = true)]
public static extern int SendARP(int DestIP, int SrcIP, byte[] pMacAddr, ref uint PhyAddrLen);

private void Ping(IPAddress address)
{
    byte[] macAddr = new byte[6];
    uint macAddrLen = uint.Parse(macAddr.Length.ToString());

    if (SendARP(int.Parse(address.ToString()), 0, macAddr, ref macAddrLen) == 0)
    {
        //SUCCESS!
    }
}