public void Open()
        {
            var openFileDialog = new OpenFileDialog {
                Filter = "Assembly|*.dll"
            };


            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                try {
                    Assembly assembly = Assembly.LoadFrom(openFileDialog.FileName);
                    IEnumerable <PerformanceSet> sets = _analyzer.GetPerformanceSets(assembly);

                    Sets.Clear();
                    foreach (PerformanceSet set in sets)
                    {
                        Sets.Add(set);
                    }
                }
                catch (Exception) {
                    Sets.Clear();
                }
            }
        }