How to check the Internet connection with .NET, C#, and WPF

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I am using .NET, C# and WPF, and I need to check whether the connection is opened to a certain URL, and I can't get any code to work that I have found on the Internet.

I tried:

Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
    IAsyncResult result = socket.BeginConnect("localhost/myfolder/", 80, null, null);
    bool success = result.AsyncWaitHandle.WaitOne(3000, true);
    if (!success)
    {
        MessageBox.Show("Web Service is down!");
    }
    else
        MessageBox.Show("Everything seems ok");
}
finally
{
    socket.Close();
}

But I always get the message that everything is OK even if I shut down my local Apache server.

I also tried:

ing ping = new Ping();
PingReply reply;
try
{
    reply = ping.Send("localhost/myfolder/");
    if (reply.Status != IPStatus.Success)
        MessageBox.Show("The Internet connection is down!");
    else
        MessageBox.Show("Seems OK");
}
catch (Exception ex)
{
    MessageBox.Show("Error: " + ex.Message);
}

But this always gives an exception (ping seems to work only pinging the server, so localhost works but localhost/myfolder/ doesnt)

Please how to check the connection so it would work for me?

Many developers are solving that "problem" just by ping-ing Google.com. Well...? :/ That will work in most (99%) cases, but how professional is to rely work of Your application on some external web service?

Instead of pinging Google.com, there is an very interesting Windows API function called InternetGetConnectedState(), that recognizes whether You have access to Internet or not.

THE SOLUTION for this situation is:

using System;
using System.Runtime;
using System.Runtime.InteropServices;
 
public class InternetAvailability
{
    [DllImport("wininet.dll")]
    private extern static bool InternetGetConnectedState(out int description, int reservedValue);
 
    public static bool IsInternetAvailable( )
    {
        int description;
        return InternetGetConnectedState(out description, 0);
    }
}

How to check the Internet connection with .NET, C#, and WPF , Hi Everybody,. In my project I want to my internet connection, when i opening my application. Already I m using the method which checks by� You can check for a network connection in .NET 2.0 using System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable() and for notify use class

In the end I used my own code:

private bool CheckConnection(String URL)
{
    try
    {
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
        request.Timeout = 5000;
        request.Credentials = CredentialCache.DefaultNetworkCredentials;
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();

        if (response.StatusCode == HttpStatusCode.OK)
            return true;
        else
            return false;
    }
    catch
    {
        return false;
    }
}

An interesting thing is that when the server is down (I turn off my Apache) I'm not getting any HTTP status, but an exception is thrown. But this works good enough :)

How to check the internet connection in c# in wpf - MSDN, config in C# .NET? 21 Jul, 2020. React Lifecycle Methods - Code Scratcher. ReactJS � React Component Lifecycle Methods. 4 Apr,� I am using .NET, C# and WPF, and I need to check whether the connection is opened to a certain URL, and I can't get any code to work that I have found on the Internet. I tried: Socket socket = new

Use this:

private bool CheckConnection()
{
    WebClient client = new WebClient();
    try
    {
        using (client.OpenRead("http://www.google.com"))
        {
        }
        return true;
    }
    catch (WebException)
    {
        return false;
    }
}

Check Internet Connection Available or Not in WPF, WPF Visual Studio Projects How to Check Internet Connection in Computer Tutorial in Csharp Duration: 3:23 Posted: Dec 9, 2015 internet - test network connectivity c# How to check the Internet connection with.NET, C#, and WPF (4) I am using .NET, C# and WPF, and I need to check whether the connection is opened to a certain URL, and I can't get any code to work that I have found on the Internet.

You can try this;

private bool CheckNet()
{
    bool stats;
    if (System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable() == true)
    {
        stats = true;
    }
    else
    {
        stats = false;
    }
    return stats;
}

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I think this will be more accurate when it comes windows applications, Windows form or WPF apps, Instead of using WebClient or HttpWebRequest,

public class InternetChecker
{
    [System.Runtime.InteropServices.DllImport("wininet.dll")]
    private extern static bool InternetGetConnectedState(out int Description, int ReservedValue);

    //Creating a function that uses the API function...
    public static bool IsConnectedToInternet()
    {
        int Desc;
        return InternetGetConnectedState(out Desc, 0);
    }

}

While calling write

if(InternetCheckerCustom.CheckNet())
{
  // Do Work 
}
else
{
  // Show Error MeassgeBox 
}

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Best practice when checking for a Internet connection : csharp, The simplest solution would be to borrow the function from VB.NET[^]. You can use it after you add a reference to the assembly "Microsoft. Check out this code to maintain VPN connection programmatically. In the TestConnection function (called every 15 seconds), a ping request is sent to an IP address to check if the connection is alive.

check internet connection available or not in c#, The 'wininet' API can be used to check the local system has active internet connection or not. The namespace used for this is 'System.Runtime. We are developing a .NET application where one of the requirements is to monitor whether the system is connected to the internet or not. We were able to get a .NET event for "ethernet cable disconnect", but if the modem is reset then this event does not get triggered.

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Comments
  • Are you trying to verify that your connection is up (in which case Ping would work), or that a certain URL is accessible?
  • Do you just need to check if the internet connection is up, or if your particular web service is up and running? They are potentially two different things.
  • That a particular web service is up and running
  • You are just checking that the connect eventually ends.
  • What kind of web services you are planning to use? I am doubting that there is one universal method to check all webservice types
  • In a test case where I am going through a proxy and the proxy is down and no browser pages load, the above method still returns true while there is technically no internet available. So this solution isn't the right one. I'm using a combination of the above AND connecting to my service :)
  • does the "wininet.dll" exist to all windows versions?
  • @user2048060 "wininet.dll" exists all windows version except Windows XP and Windows Server 2003 R2 and earlier Read more at : msdn.microsoft.com/en-us/library/windows/desktop/…
  • @AnantDabhi thanks for the resource. In addition, I also found this function msdn.microsoft.com/en-us/library/windows/desktop/… that does exactly what Rowan says. You can also add it in your response if you want.
  • What if I want an event when internet goes down
  • If you want to check your HTTP Status, grab the WebException exception and see the Status property. There's also an item called TimeOut.
  • In the end, you could just do this: return (response.StatusCode == HttpStatusCode.OK);
  • I used this method, most of times returns false even if I have internet connected and no issues in the website
  • Though it would work, it is not correct, because we still are depending on a website rather than, the PC's internet connection.