How can i print asynchronously in wpf without writeasync method?

Question

I have tried the "WriteAsync" method but it didn't work.You can see this post :http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/6996f341-cb22-4358-a833-cfaf8d0a9914 Anyone can tell me how to print asynchronously in wpf or what's the wrong which is descriced in the post above.