Converting code to VB.NET

Trying to convert the following code to VB.NET  In my attempt to do this on my own I must have missed something.  My code is below also.

Also reference my origional question that brought me to this code
https://www.experts-exchange.com/questions/22454308/MAC-ID-Physical-Address-of-server-from-the-client.html

Code to convert***************
[DllImport("iphlpapi.dll")]
public static extern int SendARP( int DestIP, int SrcIP, [Out] byte[]
pMacAddr, ref int PhyAddrLen );

IPAddress addr = IPAddress.Parse("192.168.0.1");
byte[] mac = new byte[6];
int len = mac.Length;
SendARP( (int)addr.Address, 0, mac, ref len );
string macAddress = BitConverter.ToString( mac, 0, len );

My conversion attempt*****************************

Public Class MACRetriever

    Declare Function SendARP Lib "iphlpapi.dll" Alias "SendARP" (ByVal DestIP As Int32, ByVal SrcIP As Int32, ByRef pMacAddr() As Byte, ByRef PhyAddrLen As Int32) As Int32

    Public Shared Function GetMac() As String
        Dim addr As Net.IPAddress = Net.IPAddress.Parse("10.3.1.245")
        Dim addrMe As Net.IPAddress = Net.IPAddress.Parse("10.3.1.247")
        Dim mac(6) As Byte
        Dim Mac2(6) As Byte

        Dim b As Byte
        For Each b In mac
            b = 1
        Next
        Dim len As Int32 = mac.Length
        Try
            SendARP(addr.Address, addrMe.Address, mac, len)

            Dim macAddress As String = BitConverter.ToString(Mac2, 0, len)
            Return macAddress
        Catch ex As Exception

        End Try
        Return "No Luck"
    End Function

End Class