Creating a dialup connection

//Matt
//This is a class I have done recently
//its not perfect and far from finished
//but I hope its some help
//I'm currently trying to dial a specific number
//if you come accross how I'd love to know
//rellymr

using System;
using System.Runtime.InteropServices;
public class DialUp {

[DllImport("wininet.dll",
SetLastError=true)]
public static extern int
InternetAttemptConnect(uint res);

[DllImport("wininet.dll",
SetLastError=true)]
public static extern int
InternetAutodialHangup(uint res);

[DllImport("wininet.dll",
SetLastError=true)]
public static extern bool
InternetGetConnectedState(long flags,long reserved);

[DllImport("wininet.dll",
SetLastError=true)]
public static extern int InternetDial(int
parent,string connectionid,int flags,int connection,int
reserved);

static long l1 = 0;
private static long RESERVED = 0;

public DialUp() {
}

public static void Dial() {
int hresult;
if((hresult =
InternetAttemptConnect(0)) != 0)
throw new COMException
("dial up", hresult);
}

public static void DialNumber(int number) {
int hresult;
hresult = InternetDial
(0,"",0,number,RESERVED);
}

public static void HangUp() {
int hresult;
if((hresult =
InternetAutodialHangup(0)) != 0)
throw new COMException
("hangup", hresult);
}

public static bool ConnectionState() {
bool hresult;
hresult = InternetGetConnectedState
(l1,RESERVED);
//Console.WriteLine
("Conenction:\t"+hresult);
return hresult;
}

public static string ConnectionType() {
bool hresult;
string str = null;
l1 = InternetGetConnectedState
(l1,RESERVED);
switch (l1) {
case (0):

str="INTERNET_CONNECTION_OFFLINE";
break;
case (1):

str="INTERNET_CONNECTION_MODEM";
break;
case (2):

str="INTERNET_CONNECTION_LAN";
break;
case (4):

str="INTERNET_CONNECTION_PROXY";
break;
case (8):

str="INTERNET_CONNECTION_MODEM_BUSY";
break;
}
return str;
}
}