Win32_NetworkAdapter类别包含启用/禁用方法http://msdn.microsoft.com/en-us/library/aa394216
以下是来自Programmatically Enable / Disable Connection的代码示例
如果操作需要，您需要在管理员或系统上下文中运行，理想情况下，因为系统没有UAC，所以您可以作为服务运行！

以下是我在生产中实际使用的一些VB.NET代码的示例：

Imports System.Management
Imports System.Text.RegularExpressions

            Try
                Dim scope As New ManagementScope("\\" + computername + "\root\CIMV2")
                scope.Connect()

                Dim query As New ObjectQuery( _
                    "SELECT * FROM Win32_NetworkAdapter WHERE Manufacturer != 'Microsoft' AND NOT PNPDeviceID LIKE 'ROOT\\%'")

                Dim searcher As New ManagementObjectSearcher(scope, query)

                For Each queryObj As ManagementObject In searcher.Get()

                    Dim ServiceName As String = queryObj("ServiceName")
                    Dim ProductName As String = queryObj("Description")
                    If Regex.IsMatch(ServiceName, ".*NETw.*") Then
                        'if we detect a wireless connection service name...

                        If Regex.IsMatch(queryObj("netenabled"), ".*true.*", RegexOptions.IgnoreCase) Then                                
                           MessageBox.Show(ProductName + " is already enabled! [ " + queryObj("netenabled") + " ]")

                        Else
                            'Try to enable the wireless connection here
                            queryObj.InvokeMethod("Enable", Nothing)                                
                                MessageBox.Show(ProductName + " was successfully enabled!")                               
                        End If
                    End If
                Next
            Catch ex As Exception
                Messagebox.show(ex.Message)
            End Try

编辑：添加C#等效项：

try {
ManagementScope scope = new ManagementScope("\\\\" + computername + "\\root\\CIMV2");
scope.Connect();

ObjectQuery query = new ObjectQuery("SELECT * FROM Win32_NetworkAdapter WHERE Manufacturer != 'Microsoft' AND NOT PNPDeviceID LIKE 'ROOT\\\\%'");

ManagementObjectSearcher searcher = new ManagementObjectSearcher(scope, query);

foreach (ManagementObject queryObj in searcher.Get()) {
    string ServiceName = queryObj("ServiceName");
    string ProductName = queryObj("Description");
    if (Regex.IsMatch(ServiceName, ".*NETw.*")) {
        //if we detect a wireless connection service name...

        if (Regex.IsMatch(queryObj("netenabled"), ".*true.*", RegexOptions.IgnoreCase)) {
            MessageBox.Show(ProductName + " is already enabled! [ " + queryObj("netenabled") + " ]");

        } else {
            //Try to enable the wireless connection here
            queryObj.InvokeMethod("Enable", null);
            MessageBox.Show(ProductName + " was successfully enabled!");
        }
    }
}
} catch (Exception ex) {
Messagebox.show(ex.Message);
}

我知道这个问题很古老，但对将来的某个人可能会有用，因此在这里发布了我的答案。

public class Program
{     
    static void Main(string[] args)
    {
        string command = "netsh interface set interface \"Ethernet\" enable";
        ProcessStartInfo processStartInfo = new ProcessStartInfo("CMD", command);
        Process proc = new Process();
        proc.StartInfo = processStartInfo;           
        proc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden; 
        proc.StartInfo.UseShellExecute = true;
        proc.StartInfo.Verb = "runas";            
        proc.StartInfo.Arguments = "/env /user:" + "Administrator" + " cmd /K"+ command;
        proc.StartInfo.CreateNoWindow = true;
        proc.Start();
        proc.WaitForExit();
    }
}

Ethernet是网络接口的名称。要获取网络接口的名称，只需在任何命令提示符中键入以下内容
Netsh接口显示接口
这对我来说很好，有用户帐户和管理员帐户，不需要批准管理员权限。