Perform work in response to a button click and update the UI

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This example demonstrates how you can respond to a button click by performing some work on a worker thread and then update the user interface to indicate completion

void MyButton_OnClick(object sender, EventArgs args)
{
    Task.Run(() => // Schedule work using the thread pool
        {
            System.Threading.Thread.Sleep(5000); // Sleep for 5 seconds to simulate work.
        })
    .ContinueWith(p => // this continuation contains the 'update' code to run on the UI thread
    {
        this.TextBlock_ResultText.Text = "The work completed at " + DateTime.Now.ToString()
    },
    TaskScheduler.FromCurrentSynchronizationContext()); // make sure the update is run on the UI thread.

}

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