CODEWITHSUNDEEP
c#network-programminglan
praveen
praveen

Reputation:

How to disable/enable network connection in c#

Basically I'm running some performance tests and don't want the external network to be the drag factor. I'm looking into ways of disabling network LAN. What is an effective way of doing it programmatically? I'm interested in c#. If anyone has a code snippet that can drive the point home that would be cool.

Upvotes: 31

Views: 57975

Answers (8)

Christopher Vickers
Christopher Vickers

Reputation: 1953

Looking at the other answers here, whilst some work, some do not. Windows 10 uses a different netsh command to the one that was used earlier in this chain. The problem with other solutions, is that they will open a window that will be visible to the user (though only for a fraction of a second). The code below will silently enable/disable a network connection.

The code below can definitely be cleaned up, but this is a nice start.

*** Please note that it must be run as an administrator to work ***

//Disable network interface
static public void Disable(string interfaceName)
{
    System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
    startInfo.FileName = "netsh";
    startInfo.Arguments = $"interface set interface \"{interfaceName}\" disable";
    startInfo.RedirectStandardOutput = true;
    startInfo.RedirectStandardError = true;
    startInfo.UseShellExecute = false;
    startInfo.CreateNoWindow = true;
    System.Diagnostics.Process processTemp = new System.Diagnostics.Process();
    processTemp.StartInfo = startInfo;
    processTemp.EnableRaisingEvents = true;
    try
    {
        processTemp.Start();
    }
    catch (Exception e)
    {
        throw;
    }
}

//Enable network interface
static public void Enable(string interfaceName)
{
    System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
    startInfo.FileName = "netsh";
    startInfo.Arguments = $"interface set interface \"{interfaceName}\" enable";
    startInfo.RedirectStandardOutput = true;
    startInfo.RedirectStandardError = true;
    startInfo.UseShellExecute = false;
    startInfo.CreateNoWindow = true;
    System.Diagnostics.Process processTemp = new System.Diagnostics.Process();
    processTemp.StartInfo = startInfo;
    processTemp.EnableRaisingEvents = true;
    try
    {
        processTemp.Start();
    }
    catch (Exception e)
    {
        throw;
    }
}

Upvotes: 0

FarhadMohseni
FarhadMohseni

Reputation: 424

best solution is disabling all network adapters regardless of the interface name is disabling and enabling all network adapters using this snippet (Admin rights needed for running , otherwise ITS WONT WORK) :

  static void runCmdCommad(string cmd)
    {
        System.Diagnostics.Process process = new System.Diagnostics.Process();
        System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
        //startInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
        startInfo.FileName = "cmd.exe";
        startInfo.Arguments = $"/C {cmd}";
        process.StartInfo = startInfo;
        process.Start();
    }
   static void DisableInternet(bool enable)
    {
        string disableNet = "wmic path win32_networkadapter where PhysicalAdapter=True call disable";
        string enableNet = "wmic path win32_networkadapter where PhysicalAdapter=True call enable";
        runCmdCommad(enable ? enableNet :disableNet);
    }

Upvotes: 1

user11122432
user11122432

Reputation:

If you are looking for a very simple way to do it, here you go:

    System.Diagnostics.Process.Start("ipconfig", "/release"); //For disabling internet
    System.Diagnostics.Process.Start("ipconfig", "/renew"); //For enabling internet

Make sure you run as administrator. I hope you found this helpful!

Upvotes: 6

Chris Bols
Chris Bols

Reputation: 21

For Windows 10 Change this: for diable ("netsh", "interface set interface name=" + interfaceName + " admin=DISABLE") and for enable ("netsh", "interface set interface name=" + interfaceName + " admin=ENABLE") And use the program as Administrator

    static void Disable(string interfaceName)
    {

        //set interface name="Ethernet" admin=DISABLE
        System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo("netsh", "interface set interface name=" + interfaceName + " admin=DISABLE");
        System.Diagnostics.Process p = new System.Diagnostics.Process();

        p.StartInfo = psi;
        p.Start();
    }

    static void Enable(string interfaceName)
    {
        System.Diagnostics.ProcessStartInfo psi = new System.Diagnostics.ProcessStartInfo("netsh", "interface set interface name=" + interfaceName + " admin=ENABLE");
        System.Diagnostics.Process p = new System.Diagnostics.Process();
        p.StartInfo = psi;
        p.Start();
    }

And use the Program as Administrator !!!!!!

Upvotes: 2

micharaze
micharaze

Reputation: 976

I modfied the best voted solution from Kamrul Hasan to one methode and added to wait for the exit of the process, cause my Unit Test code run faster than the process disable the connection.

private void Enable_LocalAreaConection(bool isEnable = true)
    {
        var interfaceName = "Local Area Connection";
        string control;
        if (isEnable)
            control = "enable";
        else
            control = "disable";
        System.Diagnostics.ProcessStartInfo psi =
               new System.Diagnostics.ProcessStartInfo("netsh", "interface set interface \"" + interfaceName + "\" " + control);
        System.Diagnostics.Process p = new System.Diagnostics.Process();
        p.StartInfo = psi;
        p.Start();
        p.WaitForExit();
    }

Upvotes: 0

Kamrul Hasan
Kamrul Hasan

Reputation: 241

Using netsh Command, you can enable and disable “Local Area Connection”

  interfaceName is “Local Area Connection”.

  static void Enable(string interfaceName)
    {
     System.Diagnostics.ProcessStartInfo psi =
            new System.Diagnostics.ProcessStartInfo("netsh", "interface set interface \"" + interfaceName + "\" enable");
        System.Diagnostics.Process p = new System.Diagnostics.Process();
        p.StartInfo = psi;
        p.Start();
    }

    static void Disable(string interfaceName)
    {
        System.Diagnostics.ProcessStartInfo psi =
            new System.Diagnostics.ProcessStartInfo("netsh", "interface set interface \"" + interfaceName + "\" disable");
        System.Diagnostics.Process p = new System.Diagnostics.Process();
        p.StartInfo = psi;
        p.Start();
    }

Upvotes: 20

Kamrul Hasan
Kamrul Hasan

Reputation: 241

In VB.Net , You can also use it for toggle Local Area Connection

Note: myself use it in Windows XP, it's work here properly. but in windows 7 it's not work properly.

  Private Sub ToggleNetworkConnection()

    Try


        Const ssfCONTROLS = 3


        Dim sConnectionName = "Local Area Connection"

        Dim sEnableVerb = "En&able"
        Dim sDisableVerb = "Disa&ble"

        Dim shellApp = CreateObject("shell.application")
        Dim WshShell = CreateObject("Wscript.Shell")
        Dim oControlPanel = shellApp.Namespace(ssfCONTROLS)

        Dim oNetConnections = Nothing
        For Each folderitem In oControlPanel.items
            If folderitem.name = "Network Connections" Then
                oNetConnections = folderitem.getfolder : Exit For
            End If
        Next


        If oNetConnections Is Nothing Then
            MsgBox("Couldn't find 'Network and Dial-up Connections' folder")
            WshShell.quit()
        End If


        Dim oLanConnection = Nothing
        For Each folderitem In oNetConnections.items
            If LCase(folderitem.name) = LCase(sConnectionName) Then
                oLanConnection = folderitem : Exit For
            End If
        Next


        If oLanConnection Is Nothing Then
            MsgBox("Couldn't find '" & sConnectionName & "' item")
            WshShell.quit()
        End If


        Dim bEnabled = True
        Dim oEnableVerb = Nothing
        Dim oDisableVerb = Nothing
        Dim s = "Verbs: " & vbCrLf
        For Each verb In oLanConnection.verbs
            s = s & vbCrLf & verb.name
            If verb.name = sEnableVerb Then
                oEnableVerb = verb
                bEnabled = False
            End If
            If verb.name = sDisableVerb Then
                oDisableVerb = verb
            End If
        Next



        If bEnabled Then
            oDisableVerb.DoIt()
        Else
            oEnableVerb.DoIt()
        End If


    Catch ex As Exception
        MsgBox(ex.Message)
    End Try

End Sub

Upvotes: 1

Melvyn
Melvyn

Reputation: 660

Found this thread while searching for the same thing, so, here is the answer :)

The best method I tested in C# uses WMI.

http://www.codeproject.com/KB/cs/EverythingInWmi02.aspx

Win32_NetworkAdapter on msdn

C# Snippet : (System.Management must be referenced in the solution, and in using declarations)

SelectQuery wmiQuery = new SelectQuery("SELECT * FROM Win32_NetworkAdapter WHERE NetConnectionId != NULL");
ManagementObjectSearcher searchProcedure = new ManagementObjectSearcher(wmiQuery);
foreach (ManagementObject item in searchProcedure.Get())
{
    if (((string)item["NetConnectionId"]) == "Local Network Connection")
    {
       item.InvokeMethod("Disable", null);
    }
}

Upvotes: 37

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