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We have 3 lease lines for internet connectivity in our office. When there are issues with internet connectivity, the office staff has to go to RUN --> ncpa.cpl --> Right click on network --> select properties --> TCP/IPV4 --> Change default gateway value to shift between lease lines.

I would like to develop a .NET program that is able to detect at runtime the internet connectivity and change the gateway.

I donot want to use programs available on internet, rather, create my own simple application. Please provide some usefull reference for this, I have experience in .NET coding.

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Please take a look on these websites. It might help you to some extent:

Set network configuration programmatically c#

http://social.msdn.microsoft.com/Forums/vstudio/en-US/391e01cf-4558-4375-aa1a-386ed4e3e00a/change-host-ip-address-subnet-mask-and-gateway-settings-using-c-application?forum=csharpgeneral

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OK, thanks, thats about changing configuration, any idea how to detect conenctivity.
Just use the plain function System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable() that return true of false if the connection is up.
I found this in following link, you can use it for further clarifications: stackoverflow.com/questions/2521569/…
One more reference: vbforums.com/…

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