Acess denied on system.diagnostics.process.getprocesses()

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C#

I am trying to write a code to counting all the process machine and the time spent by me on each process.

When i start to debug the following code below an exception has throw when i try to get the processStartTime.

The message is "Acess Denied".

p.StartTime 'p.StartTime' threw an exception of type 'System.ComponentModel.Win32Exception'

   em System.Diagnostics.ProcessManager.OpenProcess(Int32 processId, Int32 access, Boolean throwIfExited)
   em System.Diagnostics.Process.GetProcessHandle(Int32 access, Boolean throwIfExited)
   em System.Diagnostics.Process.GetProcessTimes()
   em System.Diagnostics.Process.get_StartTime()

Anyone can help me ?

Best regards

var list = System.Diagnostics.Process.GetProcesses();
           foreach (var p in list)
           {
               System.Diagnostics.PerformanceCounter pc = new System.Diagnostics.PerformanceCounter();

               string processStartTime = string.Empty;
               if (p.StartTime != null)
                   processStartTime = p.StartTime.ToString();
               listbox1.Items.Add(p.ProcessName + " MainWindowHandle: " + p.MainWindowTitle + " process start time: " + processStartTime);
           }