foreach (System.Diagnostics.Process thisproc in System.Diagnostics.Process.GetProcesses())    
{    
   if(thisproc.ProcessName.Equals("explorer"))    
  {    
     thisproc.Kill();    
    }    
}

------解决方案--------------------

Process[] ps = Process.GetProcesses();
           for (int i = 0; i < ps.Length; i++)
           {
               if (ps[i].ProcessName == "进程的名字")
               {
                   try
                   {
                       ps[i].Kill();
                   }
                   catch (Exception ex)
                   {
                       Console.WriteLine(ex.Message);
                   }
               }
           }