Simple Asynchronous Background Task Processing with Progress Dialog (Silverlight Solution)

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace AsyncOperation
{
    public class AsyncController
    {
        //These use Custom Tasks..
        public static void Queue(TaskBase task)
        {
            Queue(task, null, false);
        }

        public static void Queue(TaskBase task, Action<TaskBase> completionCallback)
        {
            Queue(task, completionCallback, false);
        }

        public static void Queue(TaskBase task, Action<TaskBase> completionCallback, bool wait)
        {
            //assign callback to task
            task.CompletionCallback = completionCallback;

            if (wait)
            {
                if (Deployment.Current.Dispatcher.CheckAccess())
                    throw new Exception("Wait can only be used when running on worker thread, as UI thread cannot be blocked.");

            }

            task.Start();

            if (wait)
                task.Wait();
        }


        //These use the shipped DelegateTask
        public static void Queue<TP>(Action<TP> taskRun) where TP : DefaultProgressDlg, new()
        {
            Queue<TP>(taskRun, false);
        }

        public static void Queue<TP>(Action<TP> taskRun, bool isCancellable) where TP : DefaultProgressDlg, new()
        {
            DelegateTask<TP> task = new DelegateTask<TP>(taskRun, isCancellable);

            task.Start();
        }

        //more to come...


    }
}