get cpu usage

Question

I'm trying to get the cpu usage, but I allways get a 0%. Also I tried to get avaliable ram, and it works, but not the cpu usage. code: PerformanceCounter cpuCounter; PerformanceCounter ramCounter; cpuCounter = new PerformanceCounter(); cpuCounter.CategoryName = "Processor"; cpuCounter.CounterName = "% Processor Time"; cpuCounter.InstanceName = "_Total"; ramCounter = new PerformanceCounter("Memory", "Available MBytes"); MessageBox.Show(cpuCounter.NextValue() + "%"); MessageBox.Show(ramCounter.NextValue() + "Mb"); What's wrong? or it's another way to get it? Thanks