Asynch Programming With Async Await Ex2

using System.Windows.Forms;
using System.Threading; //Added

namespace Asynch_Programming_With_Async_Await_Ex2
{

    public partial class Form1 : Form
    {
        Random rand = new Random();

        public Form1()
        {
            InitializeComponent();
        }

        private void btnTestIftheUIisLocked_Click(object sender, EventArgs e)
        {
            MessageBox.Show("Testing if the UI is locked");
        }

        private void btnwithriginalMethodLockedUI_Click(object sender, EventArgs e)
        {
            double result = DisplaySumOfRandomValues();
            richTextBox1.AppendText("Sum of Random Values: " + result);
        }

        //original method that lock UI
        private double DisplaySumOfRandomValues()
        {
            double sum = 0;
            for (int i = 1; i < 1000; i++)
            {
                sum += rand.Next(1000000, 2000000);
                Thread.Sleep(1); //simulating long running method.
            }
            return sum;
        }

        private async void btnRunMethodWithoutLockingUI_Click(object sender, EventArgs e)
        {
            double result = await GetSumOfRandomValuesAsync();
            richTextBox1.AppendText("Get Sum of Random Values: " + result);
        }
        private async Task<double> GetSumOfRandomValuesAsync()
        {
            //If nothing to return, the await task can be written as follow,
            //await Task<double>.Factory.StartNew(() =>
            Task<double> task = Task<double>.Factory.StartNew(() =>
                {
                    double sum = 0;
                    for (int i = 1; i < 1000; i++)
                    {
                        sum += rand.Next(1000000, 2000000);
                        Thread.Sleep(1); //simulating long running method.
                    }
                    return sum;
                });

            //Since the task.Result blocks/waits until the sum is returned from the task
            //you should await the task so that the method returns to the caller
            //at this point and comes back to finish the rest of the code when the task completes
            await task;
            return task.Result; //calling result from a task
        }
     
        //method for lab
        private long Fibonacci(long n)
        {
            if (n == 0) return 0;
            if (n == 1) return 1;
            return Fibonacci(n - 1) + Fibonacci(n - 2);
        }
    }
}
//Lab Assingment due Wed 3/4
//New project
//given the fibonacci series method
//define an asynchronous method that takes an input n  and returns its Fibonnacci value
//Call this method (from a button click) and display its return value.
//The UI thread should not lock up.

////www.dotnetperls.com/async
///www.codeproject.com/Tips/591586/Asynchronous-Programming-in-Csharp-using-async
////stackoverflow.com/questions/16728338/how-can-i-run-both-of-these-methods-at-the-same-time-in-net-4-5
///msdn.microsoft.com/en-us/library/vstudio/hh191443(v=vs.110).aspx#BKMK_HowtoWriteanAsyncMethod
///blog.stephencleary.com/2012/02/async-and-await.html