Setting an IP to address to be static and then dynamic in C#

Yesterday, I was with a colleague and we were discussing how to set an IP address to be static for a particular use case and then go back to being dynamic. We discussed netsh and PowerShell, but I just wanted to see if we could achieve it in C# code. So, just in case anybody else requires it, here it is.

I have made this code only change the settings for the adapter based on it’s description as obviously you wouldn’t want to change all of your adapters and will allow you to test the code.

Setting a static IP address

 string myDesc = "Intel(R) Centrino(R) Advanced-N 6205";
string gateway = "192.168.0.1";
string subnetMask = "255.255.255.0";
string address = "192.168.0.10";

var adapterConfig = new ManagementClass("Win32_NetworkAdapterConfiguration");
var networkCollection = adapterConfig.GetInstances();

foreach (ManagementObject adapter in networkCollection)
{
    string description = adapter["Description"] as string;
    if (string.Compare(description,
        myDesc, StringComparison.InvariantCultureIgnoreCase) == 0)
    {
        try
        {
            // Set DefaultGateway
            var newGateway = adapter.GetMethodParameters("SetGateways");
            newGateway["DefaultIPGateway"] = new string[] { gateway };
            newGateway["GatewayCostMetric"] = new int[] { 1 };

            // Set IPAddress and Subnet Mask
            var newAddress = adapter.GetMethodParameters("EnableStatic");
            newAddress["IPAddress"] = new string[] { address };
            newAddress["SubnetMask"] = new string[] { subnetMask };

            adapter.InvokeMethod("EnableStatic", newAddress, null);
            adapter.InvokeMethod("SetGateways", newGateway, null);

            Console.WriteLine("Updated to static IP address!");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Unable to Set IP : " + ex.Message);
        }
    }
}

Setting a dynamic IP address

 string myDesc = "Intel(R) Centrino(R) Advanced-N 6205";
var adapterConfig = new ManagementClass("Win32_NetworkAdapterConfiguration");
var networkCollection = adapterConfig.GetInstances();

foreach (ManagementObject adapter in networkCollection)
{
    string description = adapter["Description"] as string;
    if (string.Compare(description,
        myDesc, StringComparison.InvariantCultureIgnoreCase) == 0)
    {
        try
        {
            adapter.InvokeMethod("EnableDHCP", null);

            Console.WriteLine("Updated Dynamic address!");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Unable to Set IP : " + ex.Message);
        }
    }
}

Comments

• Anonymous
  May 18, 2015
  The comment has been removed
  • Anonymous
    July 13, 2016
    Check description in your PC, I Change It to "Intel(R) 82579LM Gigabit Network Connection" then it work fine and updated IP to automatic again :)
    • Anonymous
      February 24, 2017
      I have addressed these issues in following appp...https://github.com/kamran7679/ConfigureIP.git
• Anonymous
  June 15, 2016
  I have the same results as Eric, I think if IPEnabled is set to true for an adaptor, DHCP cannot then be enabled
  • Anonymous
    February 09, 2017
    Check this app.https://github.com/kamran7679/ConfigureIP.gitHopefully it will help
• Anonymous
  January 24, 2017
  Checkout this app. it sets ips of both wifi and ethernet and also show current config with cyn color buttons.https://github.com/kamran7679/ConfigureIP