A slightly more concise example that builds on top of the other answers here. I leveraged the code generation that is shipped with Visual Studio to remove most of the extra invocation code and replaced it with typed objects instead.
using System;
using System.Management;
namespace Utils
{
class NetworkManagement
{
/// <summary>
/// Returns a list of all the network interface class names that are currently enabled in the system
/// </summary>
/// <returns>list of nic names</returns>
public static string[] GetAllNicDescriptions()
{
List<string> nics = new List<string>();
using (var networkConfigMng = new ManagementClass("Win32_NetworkAdapterConfiguration"))
{
using (var networkConfigs = networkConfigMng.GetInstances())
{
foreach (var config in networkConfigs.Cast<ManagementObject>()
.Where(mo => (bool)mo["IPEnabled"])
.Select(x=> new NetworkAdapterConfiguration(x)))
{
nics.Add(config.Description);
}
}
}
return nics.ToArray();
}
/// <summary>
/// Set's the DNS Server of the local machine
/// </summary>
/// <param name="nicDescription">The full description of the network interface class</param>
/// <param name="dnsServers">Comma seperated list of DNS server addresses</param>
/// <remarks>Requires a reference to the System.Management namespace</remarks>
public static bool SetNameservers(string nicDescription, string[] dnsServers, bool restart = false)
{
using (ManagementClass networkConfigMng = new ManagementClass("Win32_NetworkAdapterConfiguration"))
{
using (ManagementObjectCollection networkConfigs = networkConfigMng.GetInstances())
{
foreach (ManagementObject mboDNS in networkConfigs.Cast<ManagementObject>().Where(mo => (bool)mo["IPEnabled"] && (string)mo["Description"] == nicDescription))
{
// NAC class was generated by opening a developer console and entering:
// mgmtclassgen Win32_NetworkAdapterConfiguration -p NetworkAdapterConfiguration.cs
// See: http://blog.opennetcf.com/2008/06/24/disableenable-network-connections-under-vista/
using (NetworkAdapterConfiguration config = new NetworkAdapterConfiguration(mboDNS))
{
if (config.SetDNSServerSearchOrder(dnsServers) == 0)
{
RestartNetworkAdapter(nicDescription);
}
}
}
}
}
return false;
}
/// <summary>
/// Restarts a given Network adapter
/// </summary>
/// <param name="nicDescription">The full description of the network interface class</param>
public static void RestartNetworkAdapter(string nicDescription)
{
using (ManagementClass networkConfigMng = new ManagementClass("Win32_NetworkAdapter"))
{
using (ManagementObjectCollection networkConfigs = networkConfigMng.GetInstances())
{
foreach (ManagementObject mboDNS in networkConfigs.Cast<ManagementObject>().Where(mo=> (string)mo["Description"] == nicDescription))
{
// NA class was generated by opening dev console and entering
// mgmtclassgen Win32_NetworkAdapter -p NetworkAdapter.cs
using (NetworkAdapter adapter = new NetworkAdapter(mboDNS))
{
adapter.Disable();
adapter.Enable();
Thread.Sleep(4000); // Wait a few secs until exiting, this will give the NIC enough time to re-connect
return;
}
}
}
}
}
/// <summary>
/// Get's the DNS Server of the local machine
/// </summary>
/// <param name="nicDescription">The full description of the network interface class</param>
public static string[] GetNameservers(string nicDescription)
{
using (var networkConfigMng = new ManagementClass("Win32_NetworkAdapterConfiguration"))
{
using (var networkConfigs = networkConfigMng.GetInstances())
{
foreach (var config in networkConfigs.Cast<ManagementObject>()
.Where(mo => (bool)mo["IPEnabled"] && (string)mo["Description"] == nicDescription)
.Select( x => new NetworkAdapterConfiguration(x)))
{
return config.DNSServerSearchOrder;
}
}
}
return null;
}
/// <summary>
/// Set's a new IP Address and it's Submask of the local machine
/// </summary>
/// <param name="nicDescription">The full description of the network interface class</param>
/// <param name="ipAddresses">The IP Address</param>
/// <param name="subnetMask">The Submask IP Address</param>
/// <param name="gateway">The gateway.</param>
/// <remarks>Requires a reference to the System.Management namespace</remarks>
public static void SetIP(string nicDescription, string[] ipAddresses, string subnetMask, string gateway)
{
using (var networkConfigMng = new ManagementClass("Win32_NetworkAdapterConfiguration"))
{
using (var networkConfigs = networkConfigMng.GetInstances())
{
foreach (var config in networkConfigs.Cast<ManagementObject>()
.Where(mo => (bool)mo["IPEnabled"] && (string)mo["Description"] == nicDescription)
.Select( x=> new NetworkAdapterConfiguration(x)))
{
// Set the new IP and subnet masks if needed
config.EnableStatic(ipAddresses, Array.ConvertAll(ipAddresses, _ => subnetMask));
// Set mew gateway if needed
if (!String.IsNullOrEmpty(gateway))
{
config.SetGateways(new[] {gateway}, new ushort[] {1});
}
}
}
}
}
}
}
Full source: https://github.com/sverrirs/DnsHelper/blob/master/src/DnsHelperUI/NetworkManagement.cs