private void LoadCounters()
        {
            PerformanceCounterCategory      category = category_ListBox.SelectedItem as PerformanceCounterCategory;
            Collection <PerformanceCounter> counters = PerfMonController.GetCounters(category, SelectedInstance);

            counter_ListBox.DataSource    = counters;
            counter_ListBox.DisplayMember = "CounterName";
            counter_ListBox.SelectedIndex = -1;
        }
        private void LoadCounters(string machineName)
        {
            if (_loadFromMachine)
            {
                string instanceName = SelectedInstance;
                PerformanceCounterCategory      category = SelectedCategory as PerformanceCounterCategory;
                Collection <PerformanceCounter> counters = PerfMonController.GetCounters(category, instanceName);
                counter_ListBox.DataSource = counters;
            }
            else
            {
                ResourceWindowsCategory instance = null;
                using (EnterpriseTestContext context = new EnterpriseTestContext())
                {
                    instance = ResourceWindowsCategory.Select(context, ResourceWindowsCategoryType.PerfMon.ToString()).Where(c => c.Name == machineName).FirstOrDefault();
                }
                counter_ListBox.DataSource = instance.Children;
            }

            counter_ListBox.DisplayMember = "Name";
            counter_ListBox.SelectedIndex = -1;
        }