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    [DllImport("wininet.dll", EntryPoint = "InternetOpenW", CharSet = CharSet.Auto, SetLastError = true)]

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    public static extern IntPtr InternetOpenW(

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        internetHandle = InternetOpenW("FTPOpen", INTERNET_OPEN_TYPE_PRECONFIG, string.Empty, string.Empty, 0);

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Call InternetOpen() and InternetConnect() to get a valid hConnect handle.

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Call InternetOpen() and InternetConnect() to get a valid hConnect handle.

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    Handle of the current Internet session. The handle must have been returned by a previous call to InternetOpen.

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static extern IntPtr InternetOpen(

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Declare Function InternetOpen Lib "wininet.dll" Alias "InternetOpenA" ( _

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  Using INTERNET_OPEN_TYPE_PRECONFIG as lAccessType, InternetOpen

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    IntPtr hInternet = InternetOpen("browser", INTERNET_OPEN_TYPE_DIRECT, null, null, 0);

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    Console.WriteLine("InternetOpen returned null.");

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    Console.WriteLine("InternetOpen succeeded.");

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    Dim hInet As Int32 = InternetOpen(HttpAgent, INTERNET_OPEN_TYPE_PRECONFIG, _

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Documentation

[InternetOpen] on MSDN