IPHostEntry hostentry = Dns.Resolve(Dns.GetHostName());
IPAddress address=hostentry.AddressList[0];

PingReply reply = new Ping().Send(address);
if (reply.Status == IPStatus.Success)
 MessageBox.Show("Ping successfully.");
else
 MessageBox.Show("Ping failure.");

SelectQuery select = new SelectQuery("select * from win32_logicaldisk");
ManagementObjectSearcher mos = new ManagementObjectSearcher(select);
foreach (ManagementObject disk in mos.Get())
{
  string msg = disk["Name"].ToString();
  DriveInfo info = new DriveInfo(msg);
  switch (info.DriveType.ToString())
  {
   case "Unknown":
    label1.Text += msg + "这是未知设备__";
    break;
   case "NoRootDirectory":
    label1.Text += msg + "这是未分区__";
    break;
   case "Removable":
    label1.Text += msg + "这是可以动磁盘__";
    break;
   case "Fixed":
    label1.Text += msg + "这是硬盘__";
    break;
   case "Network":
    label1.Text += msg + "这是网络驱动器__";
    break;
   case "CDRom":
    label1.Text += msg + "这是光驱__";
    break;
  }
}

foreach (System.Diagnostics.Process p in processes)
{
  if (p.ProcessName == "IntelliTrace")
  {
   p.Kill();
  }
}

[DllImport("winmm.dll", EntryPoint = "waveOutGetNumDevs")]
public static extern int waveOutGetNumDevs();
private void button1_Click(object sender, EventArgs e)
{
 if (waveOutGetNumDevs() != 0)
 {
  MessageBox.Show("已经安装声卡");
 }
 else {
  MessageBox.Show("未安装声卡");
 }
}