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Posted 6 May 2004
Licenced CPOL

SwitchNetConfig - Laptop users, quickly switch network and proxy configuration in different places

, 6 May 2004
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A handy utility for laptop users which stores network and proxy configuration as profiles and apply a profile very quickly whenever laptop goes to a different network


This is a tiny utility which stores multiple network and proxy configuration as profiles. You can apply a profile to set specific network setting and proxy from simple shortcuts.


If you have a laptop, when you go to different places, you have to change Network configuration and browser proxy. I have to go to 4 different places everyday with my laptop; my university, my offices and my home. Everywhere I have to change my IP setting and IE Proxy. I could write a WMI Script to do all of them. Unfortunately, for some reason WMI is not working from VB Script in my laptop but somehow it is working from .NET. So, I have made a handy utility which I can use to store configuration profiles for different places and apply them very quickly just by pressing one key and a ENTER at system startup. This program automatically sets IP, Subnet, Gateway and DNS for my LAN card and also changes the IE Proxy setting.

Using the code

You can setup in 3 easy steps.

  • 1. Click New and enter a profile name.
  • 2. Set IP configuration
  • 3. Set IE Proxy configuration

It’s even easier to use:

  • 1. Press the first letter of your profile. For example, “h” for Home.
  • 2. Press ENTER and wait as it applies the profile.
  • 3. Press ESC to quit.

Points of Interest

It’s a very simple Winforms application written in C#. The key technologies are:

  • 1. WMI
  • 2. IE Registry tweaking
  • 3. XML Serialization


Windows Management Intrumentation (WMI) helps you work with Network configuration. For example, the following code retrieves Network Setting for a given Network Card.

/// <summary>
/// Returns the network card configuration of the specified NIC
/// </summary>
/// <PARAM name="nicName">Name of the NIC</PARAM>
/// <PARAM name="ipAdresses">Array of IP</PARAM>
/// <PARAM name="subnets">Array of subnet masks</PARAM>
/// <PARAM name="gateways">Array of gateways</PARAM>
/// <PARAM name="dnses">Array of DNS IP</PARAM>
public static void GetIP( string nicName, out string [] ipAdresses, 
  out string [] subnets, out string [] gateways, out string [] dnses )
  ipAdresses = null;
  subnets = null;
  gateways = null;
  dnses = null;

  ManagementClass mc = new ManagementClass(
  ManagementObjectCollection moc = mc.GetInstances();

  foreach(ManagementObject mo in moc)
    // Make sure this is a IP enabled device. 
    // Not something like memory card or VM Ware
    if( mo["ipEnabled"] as bool )
      if( mo["Caption"].Equals( nicName ) )
        ipAdresses = (string[]) mo["IPAddress"];
        subnets = (string[]) mo["IPSubnet"];
        gateways = (string[]) mo["DefaultIPGateway"];
        dnses = (string[]) mo["DNSServerSearchOrder"];


“Win32_NetworkAdapterConfiguration” gives you the collection of network adapters installed. Be careful, all the entries in this list may not be your LAN card.

Similarly you can set Network configuration just by a couple of lines.

/// <summary>
/// Set IP for the specified network card name
/// </summary>
/// <PARAM name="nicName">Caption of the network card</PARAM>
/// <PARAM name="IpAddresses">Comma delimited string 
///           containing one or more IP</PARAM>
/// <PARAM name="SubnetMask">Subnet mask</PARAM>
/// <PARAM name="Gateway">Gateway IP</PARAM>
/// <PARAM name="DnsSearchOrder">Comma delimited DNS IP</PARAM>
public static void SetIP( string nicName, string IpAddresses, 
  string SubnetMask, string Gateway, string DnsSearchOrder)
  ManagementClass mc = new ManagementClass(
  ManagementObjectCollection moc = mc.GetInstances();

  foreach(ManagementObject mo in moc)
    // Make sure this is a IP enabled device. 
    // Not something like memory card or VM Ware
    if( mo["IPEnabled"] as bool )
      if( mo["Caption"].Equals( nicName ) )

        ManagementBaseObject newIP = 
          mo.GetMethodParameters( "EnableStatic" );
        ManagementBaseObject newGate = 
          mo.GetMethodParameters( "SetGateways" );
        ManagementBaseObject newDNS = 
          mo.GetMethodParameters( "SetDNSServerSearchOrder" );
        newGate[ "DefaultIPGateway" ] = new string[] { Gateway };
        newGate[ "GatewayCostMetric" ] = new int[] { 1 };

        newIP[ "IPAddress" ] = IpAddresses.Split( ',' );
        newIP[ "SubnetMask" ] = new string[] { SubnetMask };

        newDNS[ "DNSServerSearchOrder" ] = DnsSearchOrder.Split(',');

        ManagementBaseObject setIP = mo.InvokeMethod( 
          "EnableStatic", newIP, null);
        ManagementBaseObject setGateways = mo.InvokeMethod( 
          "SetGateways", newGate, null);
        ManagementBaseObject setDNS = mo.InvokeMethod( 
          "SetDNSServerSearchOrder", newDNS, null);


Internet Explorer Proxy

Changing Internet Explorer Proxy setting is a tricky job. There are 3 registry keys that you need to handle:

CURRENT_USER\ Software\Microsoft\Windows\CurrentVersion\Internet Settings

  • ProxyServer – string – Name of proxy server
  • ProxyEnable – integer – 1 for enabled, 0 for disabled
  • ProxyOverride – string – a list of hosts that you need to directly access without proxy

XML Serialization

XML Serialization makes it very easy to persist object graph in human readable form. For example, this is the XML that the program generates:

<?xml version="1.0"?>
<ConfigWrapper xmlns:xsd="" 

    <anyType xsi:type="Profile">
        <anyType xsi:type="NICProfile">
          <Name>[00000001] Intel(R) PRO/100 
             VE Network Connection</Name>
        <BypassAddresses />

It makes it very easy to modify the file manually. You can save an entire object graph just by writing 3 lines of code:

// Use XML Serializer to serialize the content of the specified array list
XmlSerializer serializer = new XmlSerializer( typeof( ConfigWrapper ) );
// open the profile file
StreamWriter writer = new StreamWriter( PROFILE_FILE_NAME, false );        
// Serialize the array list to the file
serializer.Serialize( writer.BaseStream, wrapper );


  • Ver 1.0 - Store multiple profiles, multiple NIC setting, IE Proxy
  • (Planning) Ver 2.0 - Execute batch file before and after profile setting


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

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Comments and Discussions

QuestionAccess Denied Error while changing DNS settints as per environments Pin
kallavinod2824-Jan-18 10:24
memberkallavinod2824-Jan-18 10:24 
QuestionNot work from Pin
MarioCortess15-Mar-17 10:29
professionalMarioCortess15-Mar-17 10:29 
QuestionCurrent config not updated when changing network card Pin
dr*white10-Jul-15 5:16
memberdr*white10-Jul-15 5:16 
GeneralMy vote of 5 Pin
Murat Aydan20-Jan-15 15:09
memberMurat Aydan20-Jan-15 15:09 
QuestionNice app, could use some more options Pin
Thomas Heck23-Apr-14 5:32
memberThomas Heck23-Apr-14 5:32 
Questionnot working Pin
Member 103263889-Oct-13 11:14
memberMember 103263889-Oct-13 11:14 
AnswerRe: not working Pin
José Longo5-Apr-15 5:44
memberJosé Longo5-Apr-15 5:44 
GeneralAmazing! Pin
Arciel31-Mar-13 16:38
memberArciel31-Mar-13 16:38 
Questionhow can I make it workable under limited user account Pin
Eric Chan1-Jan-13 1:08
memberEric Chan1-Jan-13 1:08 
AnswerRe: how can I make it workable under limited user account Pin
Omar Al Zabir1-Jan-13 1:21
memberOmar Al Zabir1-Jan-13 1:21 
GeneralRe: how can I make it workable under limited user account Pin
Eric Chan1-Jan-13 1:27
memberEric Chan1-Jan-13 1:27 
BugMy vote of 5... but not working in Windows 8 Pin
Alex Galisteo23-Dec-12 22:50
memberAlex Galisteo23-Dec-12 22:50 
GeneralMy vote of 5 Pin
osueque15-Dec-12 2:16
memberosueque15-Dec-12 2:16 
QuestionUnable to change the IP Pin
devil13007811-Nov-12 18:36
memberdevil13007811-Nov-12 18:36 
GeneralMy vote of 4 Pin
rajeshhee26-Aug-12 18:42
memberrajeshhee26-Aug-12 18:42 
Questionhelp plz Pin
AmirAmirA6-Jun-12 20:57
memberAmirAmirA6-Jun-12 20:57 
QuestionNice try, but... Pin
Schmal1-Feb-12 17:56
memberSchmal1-Feb-12 17:56 
Questionmy vote is 4 Pin
ayongwust1-Nov-11 0:28
memberayongwust1-Nov-11 0:28 
QuestionProblem with the proxy Pin
patuco30-Sep-11 1:08
memberpatuco30-Sep-11 1:08 
GeneralMy vote of 5 Pin
Basarat Ali Syed28-Feb-11 19:37
memberBasarat Ali Syed28-Feb-11 19:37 
GeneralCommand Line Pin
TeerachaiJ6-Feb-11 19:43
memberTeerachaiJ6-Feb-11 19:43 
GeneralThank's Pin
Rodolfo Centeno Sicche14-Jan-11 6:59
memberRodolfo Centeno Sicche14-Jan-11 6:59 
GeneralWorked well with Win 7 prof. Pin
maqh19-Mar-10 7:15
membermaqh19-Mar-10 7:15 
GeneralTested with several proxy IP servers and works great! Pin
proxydev18-Mar-10 12:35
memberproxydev18-Mar-10 12:35 
GeneralLoad/Save method Pin
anen30-Jan-10 18:47
memberanen30-Jan-10 18:47 

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