Dim structSize As Int32 = Marshal.SizeOf(GetType(IP_ADAPTER_INFO))

         Dim Entry As IP_ADAPTER_INFO = CType(Marshal.PtrToStructure(pEntry, GetType(IP_ADAPTER_INFO)), IP_ADAPTER_INFO)

   long structSize = Marshal.SizeOf( typeof( IP_ADAPTER_INFO ) );

       IP_ADAPTER_INFO entry = (IP_ADAPTER_INFO)Marshal.PtrToStructure( pEntry, typeof( IP_ADAPTER_INFO ));

GetAdaptersInfo returns a pointer to an IP_ADAPTER_INFO linked list.

public struct IP_ADAPTER_INFO

Public Class IP_ADAPTER_INFO