Check internet connection (availability) in C#

Check internet connection (availability) in C#

You can check for internet connectivity in C# by sending a ping request to a reliable server, such as Google's DNS server, and checking if a response is received. Here's an example code snippet:

using System.Net.NetworkInformation;

public static bool CheckInternetConnection()
{
    try
    {
        Ping myPing = new Ping();
        string host = "8.8.8.8"; // Google's DNS server
        byte[] buffer = new byte[32];
        int timeout = 1000; // Timeout in milliseconds
        PingOptions options = new PingOptions();
        PingReply reply = myPing.Send(host, timeout, buffer, options);
        return (reply.Status == IPStatus.Success);
    }
    catch (Exception)
    {
        return false;
    }
}

This method returns a boolean value indicating whether an internet connection is available or not.

Examples

  1. "C# check if the internet connection is available using Ping"

    using System.Net.NetworkInformation;

public bool IsInternetAvailable()
{
    try
    {
        using (var ping = new Ping())
        {
            var reply = ping.Send("www.google.com", 3000);
            return reply != null && reply.Status == IPStatus.Success;
        }
    }
    catch (PingException)
    {
        return false;
    }
}

    Code Description: Use the Ping class to send a ping request to a known host (e.g., Google) and check for a successful response.

  2. "C# check internet connection using NetworkInterface"

    using System.Net.NetworkInformation;

public bool IsInternetAvailable()
{
    return NetworkInterface.GetIsNetworkAvailable();
}

    Code Description: Use the NetworkInterface class to check if any network interface is available, indicating a potential internet connection.

  3. "C# check internet connection using HttpClient"

    using System.Net.Http;

public async Task<bool> IsInternetAvailableAsync()
{
    try
    {
        using (var client = new HttpClient())
        {
            var response = await client.GetAsync("http://www.google.com");
            return response.IsSuccessStatusCode;
        }
    }
    catch (HttpRequestException)
    {
        return false;
    }
}

    Code Description: Use the HttpClient to send a simple HTTP request to a known endpoint (e.g., Google) and check for a successful response.

  4. "C# check internet connection using Dns.GetHostAddresses"

    using System.Net;

public bool IsInternetAvailable()
{
    try
    {
        var addresses = Dns.GetHostAddresses("www.google.com");
        return addresses.Length > 0;
    }
    catch (Exception)
    {
        return false;
    }
}

    Code Description: Use Dns.GetHostAddresses to resolve the IP addresses associated with a host and check if any addresses are returned.

  5. "C# check internet connection using WebRequest"

    using System.Net;

public bool IsInternetAvailable()
{
    try
    {
        var request = WebRequest.Create("http://www.google.com");
        using (var response = request.GetResponse())
        {
            return true;
        }
    }
    catch (WebException)
    {
        return false;
    }
}

    Code Description: Use WebRequest to create a request to a known endpoint and check for a successful response.

  6. "C# check internet connection using InternetGetConnectedState"

    using System.Runtime.InteropServices;

public static class InternetConnectionHelper
{
    [DllImport("wininet.dll")]
    private extern static bool InternetGetConnectedState(out int description, int reservedValue);

    public static bool IsInternetAvailable()
    {
        return InternetGetConnectedState(out _, 0);
    }
}

    Code Description: Use the InternetGetConnectedState function from wininet.dll to check the overall internet connection state.

  7. "C# check internet connection using Socket"

    using System.Net.Sockets;

public bool IsInternetAvailable()
{
    try
    {
        using (var client = new TcpClient("www.google.com", 80))
        {
            return true;
        }
    }
    catch (SocketException)
    {
        return false;
    }
}

    Code Description: Use a TcpClient to attempt a connection to a known host (e.g., Google) and check for successful socket connection.

  8. "C# check internet connection using System.Net.NetworkInformation Reachability"

    using System.Net.NetworkInformation;

public bool IsInternetAvailable()
{
    try
    {
        var internetSettings = IPGlobalProperties.GetIPGlobalProperties();
        var endpoints = internetSettings.GetActiveTcpListeners();
        return endpoints.Length > 0;
    }
    catch (NetworkInformationException)
    {
        return false;
    }
}

    Code Description: Use IPGlobalProperties to retrieve information about the network interfaces and check if there are active TCP listeners.

  9. "C# check internet connection using System.Net.NetworkInformation Interface Properties"

    using System.Net.NetworkInformation;

public bool IsInternetAvailable()
{
    try
    {
        var networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
        return networkInterfaces.Any(n => n.OperationalStatus == OperationalStatus.Up && n.NetworkInterfaceType != NetworkInterfaceType.Loopback);
    }
    catch (NetworkInformationException)
    {
        return false;
    }
}

    Code Description: Use NetworkInterface to retrieve information about network interfaces and check if any operational interfaces are not of type Loopback.

  10. "C# check internet connection using WebClient"

    using System.Net;

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

    Code Description: Use WebClient to open a read stream from a known URL (e.g., Google) and check for successful connection.

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