Asp.net implements api programs for detecting whether computers are connected to the Internet

The code is as follows:

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: Wininet: = .. raw. loadDll ("Wininet. dll ") : InternetGetConnectedState = Wininet. api ("InternetGetConnectedState", "bool (int & flag, int Reserved )")   IsOnline = function (){ Return InternetGetConnectedState (0, 0 ); }   Io. open () Io. print (isOnline ()) Using System. Runtime. InteropServices; Class inet { [DllImport ("wininet. dll")] Extern static bool InternetGetConnectedState (out int connectionDescription, int ReservedValue ); Public bool isOnline ()     { Int flag = 0; Bool state = InternetGetConnectedState (out flag, 0 ); Return state;     } }