static PerformanceCounter cpuCounter;
static PerformanceCounter ramCounter;

cpuCounter = new PerformanceCounter("Processor", "% Processor Time", "_Total");
ramCounter = new PerformanceCounter("Memory", "Available MBytes");


public string getCurrentCpuUsage(){
    return cpuCounter.NextValue()+"%";
}

public string getAvailableRAM(){
    return ramCounter.NextValue()+"MB";
}