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copied!<p>@Stef7 & @Panagiotis - You guys are right that the UI thread was blocked. I'm not sure I understand why an async call blocks the UI thread though; I'll have to do more research.</p> <p>I had already tried a Background thread but that didn't resolve my issue until I implemented ContinueWith on the Task. </p> <p>Thank you for your help.</p> <p>Here is the final code.</p> <pre><code>public partial class Splash : Window { private TypeBO boType = new TypeBO(); private Stopwatch swTotal = new Stopwatch(); private Stopwatch swData= new Stopwatch(); public Splash() { InitializeComponent(); swTotal.Start(); } private void GetData() { Assembly assembly = Assembly.GetExecutingAssembly(); lblMessage.Content = "Please Wait..."; lblVersion.Content = "Version: " + assembly.GetName().Version.Major + "." + assembly.GetName().Version.Minor + "." + assembly.GetName().Version.Revision; swData.Start(); var backgroundWorker = new BackgroundWorker(); backgroundWorker.DoWork += this.OnBackgroundWorkerDoWork; backgroundWorker.RunWorkerCompleted += OnBackgroundWorkerRunWorkerCompleted; backgroundWorker.RunWorkerAsync(); } private void OnBackgroundWorkerDoWork(object sender, DoWorkEventArgs e) { WEBAPI.GetHttpClient().GetAsync("api/COStateType/GetStateTypesByCountryID/" + Constants.COUNTRY_ID_USA).ContinueWith(r => { r.Result.EnsureSuccessStatusCode(); e.Result = r.Result.Content.ReadAsAsync<List<coStateType>>().Result; }).Wait(); swData.Stop(); System.Diagnostics.Debug.Write("Splash - DATA - Total Elapsed Time - " + swData.Elapsed + Environment.NewLine); } private void OnBackgroundWorkerRunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { var backgroundWorker = sender as BackgroundWorker; backgroundWorker.DoWork -= this.OnBackgroundWorkerDoWork; backgroundWorker.RunWorkerCompleted -= OnBackgroundWorkerRunWorkerCompleted; App.stateTypes = e.Result as List<coStateType>; coStateType pleaseSelectStateType = new coStateType() { State_ID = 0, State_Nm = "Select One", Country_ID = 1 }; App.stateTypes.Insert(0, pleaseSelectStateType); sbHideState.Completed += (snd, eva) => { //Pre-Load User Controls Assembly assembly = this.GetType().Assembly; UserControl ucBHSearch = (UserControl)assembly.CreateInstance(string.Format("{0}.BHSearch", "ABS2.WPF.ADMIN.UserControls.BusinessHierarchy")); UserControl ucBHDetails = (UserControl)assembly.CreateInstance(string.Format("{0}.BHDetails", "ABS2.WPF.ADMIN.UserControls.BusinessHierarchy")); App.userControls.Add("BHD", ucBHDetails); App.userControls.Add("BHS", ucBHSearch); Login winLogin = new Login(); winLogin.Show(); swTotal.Stop(); System.Diagnostics.Debug.Write("Splash - UI - Total Elapsed Time - " + swTotal.Elapsed + Environment.NewLine + Environment.NewLine); swTotal.Reset(); this.Close(); }; sbHideState.Begin(gridSplash); } private void Window_Loaded_1(object sender, RoutedEventArgs e) { lblMessage.Content = ""; lblVersion.Content = ""; sbDefaultState.Begin(gridSplash); sbRotateState.Begin(gridSplash); } private void window_ContentRendered(object sender, EventArgs e) { sbShowState.Completed += (snd, eva) => { GetData(); }; sbShowState.Begin(gridSplash); } } </code></pre>

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