Update UI Thread with async and await

While working in WPF you may have to encounter an issue in updating UI of application. I've got through this and make a solution.

I've used two fictions to demonstrate this updateList() is an async function so that it can run in background and do not harm UI in other words if u use async and await, user will be able to minimize its application. Lets come to the point.

In other function addItemsToList()     I used a for loop and try to update UI while adding items in the list I got this error

Reason: because I am using async and await simple I just change addItemsToList() to this

this.Dispatcher.Invoke((Action)(() =>

                    {

                        listbox1.Items.Add("This is item: " + i);

                        listbox1.UpdateLayout();

                    }

                    ));

and its all good. Below here is the complete code.

private void button1_Click(object sender, RoutedEventArgs e)

        {

            updateList();

        }

        private void updateList()

        {

            await Task.Factory.StartNew(() =>

            {

                addItemsToList();

            }

             );

        }

        private void addItemsToList()

        {

            for (int i = 0; i <  1000   ; i++)

            {

                this.Dispatcher.Invoke((Action)(() =>

                    {

                        listbox1.Items.Add("This is item: " + i);

                        listbox1.UpdateLayout();

                    }

                    ));

               

            }

        }