public class DeviceMonitor

    {

        static readonly PerformanceCounter cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");

        static readonly PerformanceCounter ramCounter = new PerformanceCounter("Memory", "Available MBytes");

        static readonly PerformanceCounter uptime = new PerformanceCounter("System", "System Up Time");

        public static bool GetInternetAvilable()

        {

            bool networkUp = System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable();

            return networkUp;

        }

        public static TimeSpan GetSystemUpTime()

        {

            uptime.NextValue();

            TimeSpan ts = TimeSpan.FromSeconds(uptime.NextValue());

            return ts;

        }

        public static string GetPhysicalMemory()

        {

            string str = null;

            ManagementObjectSearcher objCS = new ManagementObjectSearcher("SELECT * FROM Win32_ComputerSystem");

            foreach (ManagementObject objMgmt in objCS.Get())

            {

                str = objMgmt["totalphysicalmemory"].ToString();

            }

            return str;

        }

        public static string getCurrentCpuUsage()

        {

            return cpuCounter.NextValue() + "%";

        }

        public static string getAvailableRAM()

        {

            return ramCounter.NextValue() + "MB";

        }

    }