>>Sorry Craig,
>>
>>I forgot to say (and to choose the correct application type when I created the message) that this is a WPF desktop application. That tool looks like it's for the web.
>>
>>Or do I understand the write up on it incorrectly?
>>
>>
>>>Look at SignalR. It may do what you want.
>>>
>>>>Hi,
>>>>
>>>>please bear with me as I am not sure of what I am doing. :)
>>>>
>>>>I have a datagrid showing some data. A background process loops through the list of items in the grid and I want to update the data shown in the grid with the result of the process as each item is dealt with.
>>>>
>>>>Specifically my grid shows a list of emails to be sent. When an email gets sent I save the time it was sent and if there was an error during the send gets saved to the email record as well. So I want this to be reflected in the grid.
>>>>
>>>>This is the code that starts off the background process
>>>>
>>>>

        private void btnEmail_Click(object sender, RoutedEventArgs e)
>>>>        {
>>>>            
>>>>            this.BackgroundWorker = new BackgroundWorker();
>>>>            this.BackgroundWorker.WorkerReportsProgress = true;
>>>>            this.BackgroundWorker.DoWork += new DoWorkEventHandler(this.EmailQueueBackgroundWorker_DoWork);
>>>>            this.BackgroundWorker.ProgressChanged += new ProgressChangedEventHandler(this.BackgroundWorker_ProgressChanged);
>>>>
>>>>            this.progressBar.Maximum = 100;
>>>>            this.progressBar.Minimum = 0;
>>>>
>>>>            //// Start the Asynch Worker
>>>>            this.BackgroundWorker.RunWorkerAsync();
>>>>        }

>>>>
>>>>This code calls the process to go through the list after first building up a list of Primary Keys of the emails to be sent:
>>>>

        private void EmailQueueBackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
>>>>        {
>>>>            // Create the process object in worker thread
>>>>            EmailQueueProcess emailQueue = new EmailQueueProcess();
>>>>
>>>>            // register the handler
>>>>            emailQueue.ProcessStateChange += new ProcessStateChangeEventHandler(SendEmail_ProcessStateChange);
>>>>            
>>>>            // build the list of Primary Keys to process
>>>>            DataTable emailQueuePKs = this.BuildEmailQueuePKsDataTable(); 
>>>>
>>>>            // Kick off the process
>>>>            emailQueue.ProcessQueue(emailQueuePKs); 
>>>>       }

>>>>
>>>>The supporting code for updating the progress bar:
>>>>

>>>>        /// <summary>
>>>>        /// State change handler for the business process
>>>>        /// </summary>
>>>>        /// <param name="sender"></param>
>>>>        /// <param name="e"></param>
>>>>        private void SendEmail_ProcessStateChange(object sender, ProcessStateChangeEventArgs e)
>>>>        {
>>>>            if (e.ProcessState == ProcessState.ProgressChanged)
>>>>            {
>>>>                this.BackgroundWorker.ReportProgress(e.ProgressPercentage, e);
>>>>            }
>>>>
>>>>        }
>>>>
>>>>        /// <summary>
>>>>        /// progress changed handler for the asynch call back of the backround worker
>>>>        /// </summary>
>>>>        /// <param name="sender"></param>
>>>>        /// <param name="e"></param>
>>>>        private void BackgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
>>>>        {
>>>>            ProcessStateChangeEventArgs businessStateArgs = e.UserState as ProcessStateChangeEventArgs;
>>>>            if (businessStateArgs != null)
>>>>            {
>>>>                // Check e.ProcessState enum and the percentage here and set the status bar appropriately
>>>>                if (businessStateArgs.ProcessState == ProcessState.ProgressChanged)
>>>>                {
>>>>                    this.progressBar.Value = e.ProgressPercentage;
>>>>
>>>>                    // can I update the datatable being displayed in the grid?
>>>>
>>>>                }
>>>>            }
>>>>        }

>>>>
>>>>Is there a way for me to hook into this code to update the datagrid to display the updated values?
>
>
>if I remember correctly, The backgroundworker thread can talk to the UI thread, but a regular thread has to be marshaled to the UI thread. If you're using MVVMlight or one of the MVVM frameworks, there are functions to do this.

Usually you need to go through a dispatcher to update the UI thread: http://msdn.microsoft.com/en-us/library/ms741870.aspx.