Detecting Network Connection Speed and Bandwidth Usage in C#

Detecting network connection speed and bandwidth usage in C#

Try using the System.Net.NetworkInformation classes. In particular, System.Net.NetworkInformation.IPv4InterfaceStatistics ought to have some information along the lines of what you're looking for.

Specifically, you can check the bytesReceived property, wait a given interval, and then check the bytesReceived property again to get an idea of how many bytes/second your connection is processing. To get a good number, though, you should try to download a large block of information from a given source, and check then; that way you should be 'maxing' the connection when you do the test, which should give more helpful numbers.

What is the best way to check for Internet connectivity using .NET?

public static bool CheckForInternetConnection(int timeoutMs = 10000, string url = null)
{
    try
    {
        url ??= CultureInfo.InstalledUICulture switch
        {
            { Name: var n } when n.StartsWith("fa") => // Iran
                "http://www.aparat.com",
            { Name: var n } when n.StartsWith("zh") => // China
                "http://www.baidu.com",
            _ =>
                "http://www.gstatic.com/generate_204",
        };

        var request = (HttpWebRequest)WebRequest.Create(url);
        request.KeepAlive = false;
        request.Timeout = timeoutMs;
        using (var response = (HttpWebResponse)request.GetResponse())
            return true;
    }
    catch
    {
        return false;
    }
}

how to display speed of internet connection in web application?

Have a look at the following page:

Determining available bandwidth

It suggests there isnt really an easy way of doing it.

This one has some ideas of how to do it though:

Detecting network connection speed and bandwidth usage in C#

Hope they help.

monitor internet usage in .net

I found Process Monitor as a very useful tool and it served my purpose so I didnt had to write any code although i am yet to check out whether it gives any API which i can use in my application to get some information I need.

Thanks everyone for helping me out.

Detect internet traffic idle state using C#

Instead of checking for idle connection you could use BITS via the SharpBITS.NET wrapper.

How do I calculate network speed?

Source : How to calculate network bandwidth speed in c#

CODE:
using System;
using System.Net.NetworkInformation;
using System.Windows.Forms;

namespace InterfaceTrafficWatch
{
    /// <summary>
    /// Network Interface Traffic Watch
    /// by Mohamed Mansour
    /// 
    /// Free to use under GPL open source license!
    /// </summary>
    public partial class MainForm : Form
    {
        /// <summary>
        /// Timer Update (every 1 sec)
        /// </summary>
        private const double timerUpdate = 1000;

        /// <summary>
        /// Interface Storage
        /// </summary>
        private NetworkInterface[] nicArr;

        /// <summary>
        /// Main Timer Object 
        /// (we could use something more efficient such 
        /// as interop calls to HighPerformanceTimers)
        /// </summary>
        private Timer timer;

        /// <summary>
        /// Constructor
        /// </summary>
        public MainForm()
        {
            InitializeComponent();
            InitializeNetworkInterface();
            InitializeTimer();
        }

        /// <summary>
        /// Initialize all network interfaces on this computer
        /// </summary>
        private void InitializeNetworkInterface()
        {
            // Grab all local interfaces to this computer
            nicArr = NetworkInterface.GetAllNetworkInterfaces();

            // Add each interface name to the combo box
            for (int i = 0; i < nicArr.Length; i++)
                cmbInterface.Items.Add(nicArr[i].Name);

            // Change the initial selection to the first interface
            cmbInterface.SelectedIndex = 0;
        }

        /// <summary>
        /// Initialize the Timer
        /// </summary>
        private void InitializeTimer()
        {
            timer = new Timer();
            timer.Interval = (int)timerUpdate;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
        }

        /// <summary>
        /// Update GUI components for the network interfaces
        /// </summary>
        private void UpdateNetworkInterface()
        {
            // Grab NetworkInterface object that describes the current interface
            NetworkInterface nic = nicArr[cmbInterface.SelectedIndex];

            // Grab the stats for that interface
            IPv4InterfaceStatistics interfaceStats = nic.GetIPv4Statistics();

            // Calculate the speed of bytes going in and out
            // NOTE: we could use something faster and more reliable than Windows Forms Tiemr
            //       such as HighPerformanceTimer http://www.m0interactive.com/archives/2006/12/21/high_resolution_timer_in_net_2_0.html
            int bytesSentSpeed = (int)(interfaceStats.BytesSent - double.Parse(lblBytesSent.Text)) / 1024;
            int bytesReceivedSpeed = (int)(interfaceStats.BytesReceived - double.Parse(lblBytesReceived.Text)) / 1024;

            // Update the labels
            lblSpeed.Text = nic.Speed.ToString();
            lblInterfaceType.Text = nic.NetworkInterfaceType.ToString();
            lblSpeed.Text = nic.Speed.ToString();
            lblBytesReceived.Text = interfaceStats.BytesReceived.ToString();
            lblBytesSent.Text = interfaceStats.BytesSent.ToString();
            lblUpload.Text = bytesSentSpeed.ToString() + " KB/s";
            lblDownload.Text = bytesReceivedSpeed.ToString() + " KB/s";

        }

        /// <summary>
        /// The Timer event for each Tick (second) to update the UI
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void timer_Tick(object sender, EventArgs e)
        {
            UpdateNetworkInterface();
        }

    }
}

How do I check for a network connection?

You can check for a network connection in .NET 2.0 using GetIsNetworkAvailable():

System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable()

To monitor changes in IP address or changes in network availability use the events from the NetworkChange class:

System.Net.NetworkInformation.NetworkChange.NetworkAvailabilityChanged
System.Net.NetworkInformation.NetworkChange.NetworkAddressChanged

determining the current link speed of WiFi in C#

Considering that it literally took me the whole entire day to find what the solution to this was, I figured I'd at least show StackOverflow for future reference what I came across and what did and did not work for this question.

tl;dr: Scroll to the The Code section

What I found

Good ol' control panel

If you are looking for the really easy way to do this you can simply go and open Contol Panel. Depending on what version of Windows you are on (in my case I'm on Windows 8), the path to the page is Control Panel >> Network and Internet >> Network and Sharing Center and then you can click on the link next to "Connections: " which will give you a window that looks like what is below.

The current link speed is highlighted in red which in my case is 36.0 Mbps. Though, of course, this might not satisfy your original question if you were intending to integrate some code with the actual value.

WMI

With a mix of Googling and whatnot, I thought I might have found something in Windows Management Instrumentation.

Long story short, AFAIK, WMI does not have what we're looking for.

WMI, in short, is a giant object database (that
can also be queried through SQL) that allows you to query information about a
Windows machine such as process, disks, etc. In WMI, everything is
represented by a class with a series of instances each with a set of
properties.

Anyhow, WMI Explorer allows you to view all of this on your machine.

I (supposedly) found two classes on MSDN that might have the info on link speed but from WMI Explorer, there was nothing useful.

The first class, MSFT_NetAdapter, did not even show up in WMI Explorer on my machine.

The second class, Win32_NetworkAdapter, showed up in WMI Explorer, but the Speed property was still incorrect. The same network adapter was showing a value of 168000000 or 168 Mbps which is not right. Though I find this strange because there was already a MaxSpeed but it was blank.

Scratch WMI off the list.

Win32 P/Invoke

Yes, of course, the solution to everything is always calling unmanaged Win32 APIs using P/Invoke magic.

This is the route used to solve the problem.

Luckily, the IP_ADAPTER_ADDRESSES structure solves the problem. If you look at the MSDN page, it's a fairly large structure but what is important here is TransmitLinkSpeed which actually works.

Calling the GetAdaptersAddresses() function will return the actual structure.

Now, the actual C# P/Invoke code. Luckily, pinvoke.net already had interop for this function which I've added. This is all that was necessary.

The Code

Finally, here is your code patched up with the new P/Invoke black magic. I've made it work as a console application for demo purposes:

Using Statements:

using System;
using System.Threading;

Code:

class Program
{
    private static void Main(string[] args)
    {
        Timer ticker = new Timer(Update, null, 0, 1000);

        // Keep the main thread from dying
        while (true)
        {
            Thread.Sleep(1000);
        }
    }

    private static void Update(object state)
    {
        ulong speed = 0;
        string adapter = "";

        string[] nameSearches = { "Wireless", "WiFi", "802.11", "Wi-Fi" };

        // The enum value of `AF_INET` will select only IPv4 adapters.
        // You can change this to `AF_INET6` for IPv6 likewise
        // And `AF_UNSPEC` for either one
        foreach (IPIntertop.IP_ADAPTER_ADDRESSES net in IPIntertop.GetIPAdapters(IPIntertop.FAMILY.AF_INET))
        {
            bool containsName = false;
            foreach (string name in nameSearches)
            {
                if (net.FriendlyName.Contains(name))
                {
                    containsName = true;
                }
            }
            if (!containsName) continue;

            speed = net.TrasmitLinkSpeed;
            adapter = net.FriendlyName;
            break;
        }
        
        string temp;
        if (speed == 0)
        {
            temp = "There is currently no Wi-Fi connection";
        }
        else
        {
            temp = string.Format("Current Wi-Fi Speed: {0} Mbps on {1}", (speed / 1000000.0), adapter);
        }
        
        Console.WriteLine(temp);
    }
}

You are then going to be looking for the actual IPIntertop class that I updated. Since it's pretty big you can find it updated at pinvoke.net or on this PasteBin in case something goes down.

Bottom Line

Windows has a lot of APIs which are somewhat broken (WMI), can have a few "leaky abstractions" (.Net), or can be a pain to work with (Win32).

Sigh, that is a lot and I hope it helps.

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