Enable/Disable network card

Hi.

Is there any possibility to control the network card ( enable/disable) using c# in .NET Framework 1.1

Thanks.Mircea

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Enable/Disable network card

DMeglio
yes it is possible to disable a particular adapter.
But what would this buy you What kind of test results are you expecting
Irro
Thank you very much.

Mircea
Val P
You must use win32 api.I think you can not do this with managed code.(But maybe there can be something in System.Management.)

Here you must stop the device server.For this you must use ControlService in advapi32 .
please look here : http://www.pinvoke.net/default.aspx/advapi32.ControlService

Maybe this will give you an idea...
MichaelEber
can you show the anser for all of us ,thanks you
hlee

Although I have never done this in code, I beleive this can be done using WMI. The following links should provide the information you need:

http://msdn.microsoft.com/library/default.asp url=/library/en-us/wmisdk/wmi/wmi_tasks__networking.asp

http://www.codeproject.com/csharp/wmimadeeasy.asp
sahina
Can you point me to the right direction so I can solve this problem

Thanks.
Mircea
marina B.
I want to simulate this, that's all.
So, I am interesting in doing this and I wanna know the way how to do this.
YoungEngineer
NO

SysDev

Here is some sample C++ code that disables/enables all connections on the machine, but you should be able to tweak it to do what you need. Note that this code has not been thoroughly tested and is just intended to get you started.

If you search the internet for INetConnectionManager, you should be able to find some samples where these objects are used in C#.

HRESULT DisableEnableConnections(BOOL bEnable)
{
HRESULT hr = E_FAIL;

CoInitialize(NULL);

    INetConnectionManager *pNetConnectionManager = NULL;
hr = CoCreateInstance(CLSID_ConnectionManager,
                          NULL,
                          CLSCTX_LOCAL_SERVER | CLSCTX_NO_CODE_DOWNLOAD,
                          IID_INetConnectionManager,
                          reinterpret_cast<LPVOID *>(&pNetConnectionManager)
                         );
    if (SUCCEEDED(hr))
    {
        /*
  Get an enumurator for the set of connections on the system
  */
        IEnumNetConnection* pEnumNetConnection;
        pNetConnectionManager->EnumConnections(NCME_DEFAULT, &pEnumNetConnection);

ULONG ulCount = 0;
BOOL fFound = FALSE;

        hr = HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND);

        HRESULT hrT = S_OK;

        /*
   Enumurate through the list of adapters on the system and look for the one we want
   NOTE: To include per-user RAS connections in the list, you need to set the COM
   Proxy Blanket on all the interfaces. This is not needed for All-user RAS
   connections or LAN connections.
  */
        do
        {
            NETCON_PROPERTIES* pProps = NULL;
            INetConnection *   pConn;

            /*
   Find the next (or first connection)
   */
            hrT = pEnumNetConnection->Next(1, &pConn, &ulCount);

            if (SUCCEEDED(hrT) && 1 == ulCount)
            {
    /*
    Get the connection properties
    */
                hrT = pConn->GetProperties(&pProps);

    if (S_OK == hrT)
                {
     printf("* %S\n", pProps->pszwName);

     if (bEnable)
     {
      printf("      Enabling adapter: %S...\n",pProps->pszwName);
      hr = pConn->Connect();
     }
     else
     {
      printf("      Disabling adapter: %S...\n",pProps->pszwName);
      hr = pConn->Disconnect();
     }

                    CoTaskMemFree (pProps->pszwName);
                    CoTaskMemFree (pProps->pszwDeviceName);
                    CoTaskMemFree (pProps);
                }

                pConn->Release();
                pConn = NULL;
            }

} while (SUCCEEDED(hrT) && 1 == ulCount && !fFound);

        if (FAILED(hrT))
        {
            hr = hrT;
        }

        pEnumNetConnection->Release();
    }

    if (FAILED(hr) && hr != HRESULT_FROM_WIN32(ERROR_RETRY))
    {
        printf("Could not enable or disable connection (0x%08x)\r\n", hr);
    }

pNetConnectionManager->Release();

CoUninitialize();

return hr;
}

Rob-Nick
Thank you for your answer.
I was using the Mike Flasko sugestion and now I am able to do what I wanted.
Thank you to all of you.

Best Regards.
Mircea
Radovici
I am not clear when you say enable/disable a specific connection.
Why would you want to do that
What is the scenario
-Terry_K-
When you look in network connections from "Start->Settings" you see at least one connection. One of these is "Local Area Connection". I want to interrupt this one, not the others.
I don't know if I was clear.
The scenario is this: I want to interrupt this connection for test my client-server application; in fact, I want to create a test project that can be run without any user interaction.
Mircea
Rick Winter
It is a good point.
I figured out that I don't need to enable/disable the network card: I am interested in disabling/enabling a specific connection, not the whole connections from the network card.
Any ideea
Thanks.
Mircea

Jason Hamlin

I think the answer he is refering to is the one from Mike Flasko:

Mike Flasko wrote:

Although I have never done this in code, I beleive this can be done using WMI. The following links should provide the information you need:

http://msdn.microsoft.com/library/default.asp url=/library/en-us/wmisdk/wmi/wmi_tasks__networking.asp

http://www.codeproject.com/csharp/wmimadeeasy.asp

Enable/Disable network card

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