public static extern int SendARP(

  Declare Function SendARP Lib "iphlpapi.dll" (

SendARP returns 0 on success. The parameter SrcIP can be 0.

    SendARP(CType(addr.Address, UInt32), 0, mac, len)

int retValue = SendARP(uintAddress, 0, macAddr, ref macAddrLen);

    throw new Win32Exception(retValue, "SendARP failed.");

    Dim retValue = SendARP(uintAddress, 0, macAddr, macAddrLen)