Move application files to sub-folder

Application/Options/FeedWindow.xaml.cs

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+using Common.Wpf.Extensions;
+using System.Linq;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Media;
+
+namespace FeedCenter.Options
+{
+    public partial class FeedWindow
+    {
+        public FeedWindow()
+        {
+            InitializeComponent();
+        }
+
+        public bool? Display(FeedCenterEntities database, Feed feed, Window owner)
+        {
+            // Bind the category combo box
+            categoryComboBox.ItemsSource = database.Categories;
+
+            // Set the data context
+            DataContext = feed;
+
+            // Set the title based on the state of the feed
+            Title = string.IsNullOrWhiteSpace(feed.Link) ? Properties.Resources.FeedWindowAdd : Properties.Resources.FeedWindowEdit;
+
+            // Set the window owner
+            Owner = owner;
+
+            // Show the dialog and result the result
+            return ShowDialog();
+        }
+
+        private void HandleOkayButtonClick(object sender, RoutedEventArgs e)
+        {
+            // Get a list of all framework elements and explicit binding expressions
+            var bindingExpressions = this.GetBindingExpressions(new[] { UpdateSourceTrigger.Explicit });
+
+            // Loop over each binding expression and clear any existing error
+            this.ClearAllValidationErrors(bindingExpressions);
+
+            // Force all explicit bindings to update the source
+            this.UpdateAllSources(bindingExpressions);
+
+            // See if there are any errors
+            var hasError = bindingExpressions.Any(b => b.BindingExpression.HasError);
+
+            // If there was an error then set focus to the bad controls
+            if (hasError)
+            {
+                // Get the first framework element with an error
+                var firstErrorElement = bindingExpressions.First(b => b.BindingExpression.HasError).FrameworkElement;
+
+                // Loop over each tab item
+                foreach (TabItem tabItem in optionsTabControl.Items)
+                {
+                    // Cast the content as visual
+                    var content = (Visual) tabItem.Content;
+
+                    // See if the control with the error is a descendant 
+                    if (firstErrorElement.IsDescendantOf(content))
+                    {
+                        // Select the tab
+                        tabItem.IsSelected = true;
+                        break;
+                    }
+                }
+
+                // Set focus
+                firstErrorElement.Focus();
+
+                return;
+            }
+
+            // Dialog is good
+            DialogResult = true;
+
+            // Close the dialog
+            Close();
+        }
+    }
+}