If we write MessageBox.Show() before while loop it works fine.But write after while it stuck some where and thread method is also not invoke.Please advice..

public partial class MainWindow : Window
   {
       public MainWindow()
       {
           InitializeComponent();
           Thread thread = new Thread(GetValue);
           Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Normal,
                                                         new Action(thread.Start));
           MessageBox.Show("Show Down");
           int i = 0;
           while (i == 0)
           {
               if (thread.IsAlive)
               {
                   thread.Join();
                   i++;
               }
           }
       }

       public void GetValue()
       {
           MessageBox.Show("Show Up");
       }
   }