public void CalcRandom(int count) { try { var number1 = new Random().Next(0, 10000); var number2 = new Random().Next(0, 10000); var taskList = new List <Task>(); Parallel.For(1, count, index => { logger.Info($"Start task {index}"); var task = App.EvaluateExAsync($"{number1}+{number2}"); taskList.Add(task); taskList.Add(App.AbortModalAsync(false)); }); Task.WaitAll(taskList.ToArray()); } catch (Exception ex) { logger.Error(ex, $"***** The method {nameof(CalcRandom)} was failed.", ex); } }