Multi-threaded in windows phone c#

Hello all I am doing the code return a messageBox after the click of a button. After the click of the screen do not freeze, or a capture did not return an error. When you run debug I get unauthorized access. And two routedEventArg and EventArg work also with the button. Dispatcher without lambda give a correct return type. In total, two method. first type void StartRunning try-catch with the second method running coming out of a task
If someone could help thanks

private void StartRunning(object sender, EventArgs args)
{   

        try
        {
            Dispatcher.BeginInvoke(() => { Running(); });
        }
         catch (Exception ex)
         {
             MessageBox.Show(ex.Message);
         }
    }

public async Task Running()
    {
        await Task.Run(() =>
        {
            MessageBox.Show("hello");
        });
    }

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Tags: Windows

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