SoftwareEngineering2/WindowsFormsAppTask/WindowsFormsAppTask/Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;


namespace WindowsFormsAppTask
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Button1_Click(object sender, EventArgs e)
        {
            var t = new Task(DoIt);
            t.Start();

            for (int i = 0; i < 999; i++)
            {
                textBox1.Text += "-";
                Application.DoEvents(); //update ui elements
                Thread.Sleep(100);
            }
        }


        private void DoIt()
        {
            //Console.WriteLine(".");

            for (int i = 0; i < 999; i++)
            {
                if (textBox1.InvokeRequired)
                {
                    textBox1.Invoke(new MethodInvoker(() => { textBox1.Text += "x"; }));
                }
                else
                {
                    textBox1.Text += "x";
                }

                Random random = new Random();
                Thread.Sleep(random.Next(100, 500));
            }
        }

        private void TextBox1_TextChanged(object sender, EventArgs e)
        {
        }
    }
}