public static extern uint WlanScan(IntPtr hClientHandle,ref Guid pInterfaceGuid,IntPtr pDot11Ssid,IntPtr pIeData,IntPtr pReserved);

Public Shared Function WlanScan(ByVal hClientHandle As IntPtr, ByRef pInterfaceGuid As Guid, ByVal pDot11Ssid As IntPtr, ByVal pIeData As IntPtr, ByVal pReserved As IntPtr) As UInteger

      uint resultCode = WlanScan(wlanHndl, ref g, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero);