System.Diagnostics.PerformanceCounter CpuWatch = new System.Diagnostics.PerformanceCounter();//新建一个性能计数器
  //设置属性
  CpuWatch.CategoryName = "Processor";
  CpuWatch.CounterName = "% Processor Time";
  CpuWatch.InstanceName = "_Total";
  //显示cpu使用率,第二个参数就是取小数点几位，这里取2位
  MessageBox.Show(Math.Round(CpuWatch.NextValue(), 2).ToString());

------解决方案--------------------
http://www.codeproject.com/Articles/10258/How-to-get-CPU-usage-of-processes-and-threads看看这个吧  这个好

------解决方案--------------------
http://zhidao.baidu.com/question/328335278.html
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C# code
System.Diagnostics.PerformanceCounter CpuWatch = new System.Diagnostics.PerformanceCounter();//新建一个性能计数器
//设置属性
CpuWatch.CategoryNam……