Run manual refresh asynchronously to keep UI responsive

MainWindow.xaml.cs

@@ -67,6 +67,7 @@ namespace C4IT_CustomerPanel
         private DispatcherTimer _regularTimer;
         private DispatcherTimer _checkServerConnectionTimer;
         private bool _initialTimerInvocationDone = false;
+        private bool _manualRefreshInProgress = false;
         private TimeSpan _lastTicketInterval;
         private TimeSpan _lastAdHocInterval;
         private TimeSpan _lastRegularInterval;
@@ -1461,11 +1462,45 @@ namespace C4IT_CustomerPanel
             }
         }
 
-        private void OnRefreshClicked(object sender, MouseButtonEventArgs e)
+        private async Task TriggerManualRefreshAsync()
         {
-            OnReloadTimerElapsed(sender, e);
+            if (_manualRefreshInProgress)
-            OnAdHocTimerElapsed(sender, e);
+                return;
-            OnRegularTimerElapsed(sender, e);
+
+            var CM = MethodBase.GetCurrentMethod();
+            LogMethodBegin(CM);
+
+            _manualRefreshInProgress = true;
+
+            try
+            {
+                bool force = ((Keyboard.Modifiers & ModifierKeys.Alt) == ModifierKeys.Alt);
+                if (RefreshIcon != null)
+                    RefreshIcon.IsEnabled = false;
+
+                await Task.WhenAll(
+                    OnReloadTimerElapsedAsync(force),
+                    OnAnnoncementTimerReloadAsync(announcementType.Adhoc),
+                    OnAnnoncementTimerReloadAsync(announcementType.Regular));
+
+                SetAppearance(false);
+            }
+            catch (Exception E)
+            {
+                LogException(E);
+            }
+            finally
+            {
+                if (RefreshIcon != null)
+                    RefreshIcon.IsEnabled = true;
+                _manualRefreshInProgress = false;
+                LogMethodEnd(CM);
+            }
+        }
+
+        private async void OnRefreshClicked(object sender, MouseButtonEventArgs e)
+        {
+            await TriggerManualRefreshAsync();
         }
 
         private void OnCloseClicked(object sender, MouseButtonEventArgs e)
@@ -1487,9 +1522,9 @@ namespace C4IT_CustomerPanel
             HideMainForm();
         }
 
-        private void OnRefreshButtonClick(object sender, RoutedEventArgs e)
+        private async void OnRefreshButtonClick(object sender, RoutedEventArgs e)
         {
-            OnRefreshClicked(sender, null);
+            await TriggerManualRefreshAsync();
         }
 
         private void OnMinimizeButtonClick(object sender, RoutedEventArgs e)