Internet connection detection

[ThunderMusic]

Hi,
probably the question have been asked many times, but I can't find the
answer anywhere. Is there a way to detect if an internet connection is
active? just like Internet explorers detect you are offline when you try to
open it when not connected (then asks if you want to connect or work
offline). I need to detect if there is an internet connection available.

And if possible too (for another project) detect if a network connection
still work other than ping the main server (like know if the network cable
is not connected or adapter disabled and this kind of stuff)

Thanks

ThunderMusic

[Tom Shelton]

In article <#n**************@TK2MSFTNGP15.phx.gbl>, ThunderMusic wrote:

Hi,
probably the question have been asked many times, but I can't find the
answer anywhere. Is there a way to detect if an internet connection is
active? just like Internet explorers detect you are offline when you try to
open it when not connected (then asks if you want to connect or work
offline). I need to detect if there is an internet connection available.

And if possible too (for another project) detect if a network connection
still work other than ping the main server (like know if the network cable
is not connected or adapter disabled and this kind of stuff)

Thanks

ThunderMusic

http://vb.mvps.org/samples/project.asp?id=NetConnect

This is an example written in VB6 by Karl Peterson. Should be fairly
straight forward to convert to VB.NET.

--
Tom Shelton [MVP]

[ThunderMusic]

thanks, I'll give it a try.

"Tom Shelton" <to*@YOUKNOWTHEDRILLmtogden.com> a écrit dans le message de
news:uo**************@TK2MSFTNGP09.phx.gbl...

In article <#n**************@TK2MSFTNGP15.phx.gbl>, ThunderMusic wrote:

Hi,
probably the question have been asked many times, but I can't find the
answer anywhere. Is there a way to detect if an internet connection is
active? just like Internet explorers detect you are offline when you try to open it when not connected (then asks if you want to connect or work
offline). I need to detect if there is an internet connection available.

And if possible too (for another project) detect if a network connection
still work other than ping the main server (like know if the network cable is not connected or adapter disabled and this kind of stuff)

Thanks

ThunderMusic

http://vb.mvps.org/samples/project.asp?id=NetConnect

This is an example written in VB6 by Karl Peterson. Should be fairly
straight forward to convert to VB.NET.

--
Tom Shelton [MVP]

[Cathal Connolly [VB MVP]]

If you're developing a 2.0 app, then you can use
My.Computer.Network.Isavailable(). If you're using 1.1, then it's equivalent
is:
Imports System.Net.NetworkInformation
Public ReadOnly Property IsAvailable() As Boolean
Get
For Each NetInterface As NetworkInterface In _
NetworkInterface.GetAllNetworkInterfaces()
If NetInterface.Type <> InterfaceType.Loopback _
AndAlso NetInterface.Type <> InterfaceType.Tunnel _
AndAlso NetInterface.OperationalStatus = _
OperationalStatus.Up Then
Return True
End If
Next
Return False
End Get
End Property

Cathal
"ThunderMusic" <NO*******@sympatico.caSPAMATALL> wrote in message
news:%2****************@TK2MSFTNGP15.phx.gbl...

Hi,
probably the question have been asked many times, but I can't find the
answer anywhere. Is there a way to detect if an internet connection is
active? just like Internet explorers detect you are offline when you try to open it when not connected (then asks if you want to connect or work
offline). I need to detect if there is an internet connection available.

And if possible too (for another project) detect if a network connection
still work other than ping the main server (like know if the network cable
is not connected or adapter disabled and this kind of stuff)

Thanks

ThunderMusic

[£ukasz]

ThunderMusic wrote:

Hi,
probably the question have been asked many times, but I can't find the
answer anywhere. Is there a way to detect if an internet connection is
active? just like Internet explorers detect you are offline when you try to
open it when not connected (then asks if you want to connect or work
offline). I need to detect if there is an internet connection available.

And if possible too (for another project) detect if a network connection
still work other than ping the main server (like know if the network cable
is not connected or adapter disabled and this kind of stuff)

Thanks

ThunderMusic

You can also use that code:

[DllImport("url.dll")]
public static extern bool InetIsOffline(int dwFlags);
public static bool IsOffline()
{
return InetIsOffline(0);
}
public static bool IsOnline()
{
return !InetIsOffline(0);
}

£ukasz

[ThunderMusic]

My VS 2003 cannot find the System.Net.NetworkInformation namespace. Do I
have to add a reference to something? and btw, it is not in the msdn
documentation.

thanks

"Cathal Connolly [VB MVP]" <cc*******@eg-consulting.com> a écrit dans le
message de news:eH**************@TK2MSFTNGP10.phx.gbl...

If you're developing a 2.0 app, then you can use
My.Computer.Network.Isavailable(). If you're using 1.1, then it's equivalent is:
Imports System.Net.NetworkInformation
Public ReadOnly Property IsAvailable() As Boolean
Get
For Each NetInterface As NetworkInterface In _
NetworkInterface.GetAllNetworkInterfaces()
If NetInterface.Type <> InterfaceType.Loopback _
AndAlso NetInterface.Type <> InterfaceType.Tunnel _
AndAlso NetInterface.OperationalStatus = _
OperationalStatus.Up Then
Return True
End If
Next
Return False
End Get
End Property

Cathal
"ThunderMusic" <NO*******@sympatico.caSPAMATALL> wrote in message
news:%2****************@TK2MSFTNGP15.phx.gbl...

Hi,
probably the question have been asked many times, but I can't find the
answer anywhere. Is there a way to detect if an internet connection is
active? just like Internet explorers detect you are offline when you try

to

open it when not connected (then asks if you want to connect or work
offline). I need to detect if there is an internet connection available.

And if possible too (for another project) detect if a network connection
still work other than ping the main server (like know if the network cable is not connected or adapter disabled and this kind of stuff)

Thanks

ThunderMusic

[ThunderMusic]

ok, maybe something is missing because yesterday night I lost internet
connection and the way you provided me still detected my computer as
connected to the internet. Maybe there is some caching going on, but I don't
understand because the flag INTERNET_FLAG_NO_CACHE_WRITE is present... So Am
I missing something?

thanks for the information

ThunderMusic
"Tom Shelton" <to*@YOUKNOWTHEDRILLmtogden.com> a écrit dans le message de
news:uo**************@TK2MSFTNGP09.phx.gbl...

In article <#n**************@TK2MSFTNGP15.phx.gbl>, ThunderMusic wrote:

Hi,
probably the question have been asked many times, but I can't find the
answer anywhere. Is there a way to detect if an internet connection is
active? just like Internet explorers detect you are offline when you try to open it when not connected (then asks if you want to connect or work
offline). I need to detect if there is an internet connection available.

And if possible too (for another project) detect if a network connection
still work other than ping the main server (like know if the network cable is not connected or adapter disabled and this kind of stuff)

Thanks

ThunderMusic

http://vb.mvps.org/samples/project.asp?id=NetConnect

This is an example written in VB6 by Karl Peterson. Should be fairly
straight forward to convert to VB.NET.

--
Tom Shelton [MVP]

[ThunderMusic]

ok, with my searches, the System.Net.NetworkInformation namespace is in VS
2005... :(
"ThunderMusic" <NO*******@sympatico.caSPAMATALL> a écrit dans le message de
news:em***************@TK2MSFTNGP09.phx.gbl...

My VS 2003 cannot find the System.Net.NetworkInformation namespace. Do I
have to add a reference to something? and btw, it is not in the msdn
documentation.

thanks

"Cathal Connolly [VB MVP]" <cc*******@eg-consulting.com> a écrit dans le
message de news:eH**************@TK2MSFTNGP10.phx.gbl...

If you're developing a 2.0 app, then you can use
My.Computer.Network.Isavailable(). If you're using 1.1, then it's

equivalent

is:
Imports System.Net.NetworkInformation
Public ReadOnly Property IsAvailable() As Boolean
Get
For Each NetInterface As NetworkInterface In _
NetworkInterface.GetAllNetworkInterfaces()
If NetInterface.Type <> InterfaceType.Loopback _
AndAlso NetInterface.Type <> InterfaceType.Tunnel _
AndAlso NetInterface.OperationalStatus = _
OperationalStatus.Up Then
Return True
End If
Next
Return False
End Get
End Property

Cathal
"ThunderMusic" <NO*******@sympatico.caSPAMATALL> wrote in message
news:%2****************@TK2MSFTNGP15.phx.gbl...

Hi,
probably the question have been asked many times, but I can't find the
answer anywhere. Is there a way to detect if an internet connection is
active? just like Internet explorers detect you are offline when you try

to

open it when not connected (then asks if you want to connect or work
offline). I need to detect if there is an internet connection

available.
And if possible too (for another project) detect if a network connection still work other than ping the main server (like know if the network

cable is not connected or adapter disabled and this kind of stuff)

Thanks

ThunderMusic

[Ross Presser]

On Tue, 30 Aug 2005 12:07:53 -0400, ThunderMusic wrote:

My VS 2003 cannot find the System.Net.NetworkInformation namespace. Do I
have to add a reference to something? and btw, it is not in the msdn
documentation.

Cathal Connolly's reply *began* with these words:
"Cathal Connolly [VB MVP]" <cc*******@eg-consulting.com> a écrit dans le
message de news:eH**************@TK2MSFTNGP10.phx.gbl...

If you're developing a 2.0 app, then you can use

"developing a 2.0 app" means using the .NET 2.0 framework, which would
generally imply using one of the VS.NET 2005 tools. (Although a madman
could be doing it entirely with the commandline compilers.)

[ThunderMusic]

yes but she added something afterward :

If you're developing a 2.0 app, then you can use
My.Computer.Network.Isavailable(). If you're using 1.1, then it's equivalent is:
Imports System.Net.NetworkInformation
So if I'm using 2.0, use Me.Computer.Network.Isavailable and if I'm using
1.1, then go for it's equivalent System.Net.NetworkInformation, which does
not seems to be in 1.1 is there an error in the name of the namespace or
just just tought this namespace was available to 1.1?

thanks

"Ross Presser" <rp******@NOSPAMgmail.com.invalid> a écrit dans le message de
news:v2**************@rosspresser.dyndns.org... On Tue, 30 Aug 2005 12:07:53 -0400, ThunderMusic wrote:

My VS 2003 cannot find the System.Net.NetworkInformation namespace. Do I
have to add a reference to something? and btw, it is not in the msdn
documentation.

Cathal Connolly's reply *began* with these words:

"Cathal Connolly [VB MVP]" <cc*******@eg-consulting.com> a écrit dans le
message de news:eH**************@TK2MSFTNGP10.phx.gbl...

If you're developing a 2.0 app, then you can use

"developing a 2.0 app" means using the .NET 2.0 framework, which would
generally imply using one of the VS.NET 2005 tools. (Although a madman
could be doing it entirely with the commandline compilers.)