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how to check internet connection is available in C#?

Anonymous User326608-Jun-2013
Hi Mindstickians,

I'm developing one windows application, where we perform some task related to internet connection. 
So please tell me how to check internet connection is available or not in C#.

Thanks in advance. 
c#c# 
Updated on 08-Jun-2013
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1 Answers

Vijay Shukla

Vijay Shukla

08-Jun-2013
Hello lois waisbrooker !
Copy this code snippets and paste where which you want, This method return a bool type value and its parameter get a long value for minimumSpeed of your internet.

public static bool IsNetworkAvailable(long minimumSpeed)
        {
            if (!NetworkInterface.GetIsNetworkAvailable())
                return false;

            foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
            {
                // discard because of standard reasons
                if ((ni.OperationalStatus != OperationalStatus.Up) ||
                    (ni.NetworkInterfaceType == NetworkInterfaceType.Loopback) ||
                    (ni.NetworkInterfaceType == NetworkInterfaceType.Tunnel))
                    continue;

                // this allow to filter modems, serial, etc.
                // I use 10000000 as a minimum speed for most cases
                if (ni.Speed < minimumSpeed)
                    continue;

                // discard virtual cards (virtual box, virtual pc, etc.)
                if ((ni.Description.IndexOf("virtual", StringComparison.OrdinalIgnoreCase) >= 0) ||
                    (ni.Name.IndexOf("virtual", StringComparison.OrdinalIgnoreCase) >= 0))
                    continue;

                // discard "Microsoft Loopback Adapter", it will not show as NetworkInterfaceType.Loopback but as Ethernet Card.
                if (ni.Description.Equals("Microsoft Loopback Adapter", StringComparison.OrdinalIgnoreCase))
                    continue;

                return true;
            }
            return false;
        }

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